Backward incompatible: Turn on PureOperatorBuiltins: use only enum-based built-in functions in the AST.

If this breaks your AST consumer, best is to modify it to test
against the enum values instead of doing string comparisons on
built-in function names.  This is the reason the change was made.

If you need the old behavior, you should be able to get it back by changing
PureOperatorBuiltins to be false instead of true.  This path will work for
a while, but is marked deprecated.

Also, the old behavior is tagged as release 2.4.

Test/baseResults/150.frag.out

@@ -28,51 +28,51 @@ ERROR: node is still EOpNull!
 0:33      Sequence
 0:33        move second child to first child (temp 2-component vector of int)
 0:33          't11' (temp 2-component vector of int)
-0:33          Function Call: textureSize(s2M1; (global 2-component vector of int)
+0:33          textureSize (global 2-component vector of int)
 0:33            'sms' (uniform sampler2DMS)
 0:34      Sequence
 0:34        move second child to first child (temp 2-component vector of int)
 0:34          't12' (temp 2-component vector of int)
-0:34          Function Call: textureSize(is2M1; (global 2-component vector of int)
+0:34          textureSize (global 2-component vector of int)
 0:34            'isms' (uniform isampler2DMS)
 0:35      Sequence
 0:35        move second child to first child (temp 2-component vector of int)
 0:35          't13' (temp 2-component vector of int)
-0:35          Function Call: textureSize(us2M1; (global 2-component vector of int)
+0:35          textureSize (global 2-component vector of int)
 0:35            'usms' (uniform usampler2DMS)
 0:36      Sequence
 0:36        move second child to first child (temp 3-component vector of int)
 0:36          't21' (temp 3-component vector of int)
-0:36          Function Call: textureSize(sA2M1; (global 3-component vector of int)
+0:36          textureSize (global 3-component vector of int)
 0:36            'smsa' (uniform sampler2DMSArray)
 0:37      Sequence
 0:37        move second child to first child (temp 3-component vector of int)
 0:37          't22' (temp 3-component vector of int)
-0:37          Function Call: textureSize(isA2M1; (global 3-component vector of int)
+0:37          textureSize (global 3-component vector of int)
 0:37            'ismsa' (uniform isampler2DMSArray)
 0:38      Sequence
 0:38        move second child to first child (temp 3-component vector of int)
 0:38          't23' (temp 3-component vector of int)
-0:38          Function Call: textureSize(usA2M1; (global 3-component vector of int)
+0:38          textureSize (global 3-component vector of int)
 0:38            'usmsa' (uniform usampler2DMSArray)
 0:39      Sequence
 0:39        move second child to first child (temp 4-component vector of float)
 0:39          't31' (temp 4-component vector of float)
-0:39          Function Call: texelFetch(s2M1;vi2;i1; (global 4-component vector of float)
+0:39          textureFetch (global 4-component vector of float)
 0:39            'sms' (uniform sampler2DMS)
 0:39            'p2' (flat in 2-component vector of int)
 0:39            'samp' (flat in int)
 0:40      Sequence
 0:40        move second child to first child (temp 4-component vector of int)
 0:40          't32' (temp 4-component vector of int)
-0:40          Function Call: texelFetch(is2M1;vi2;i1; (global 4-component vector of int)
+0:40          textureFetch (global 4-component vector of int)
 0:40            'isms' (uniform isampler2DMS)
 0:40            'p2' (flat in 2-component vector of int)
 0:40            'samp' (flat in int)
 0:41      Sequence
 0:41        move second child to first child (temp 4-component vector of uint)
 0:41          't33' (temp 4-component vector of uint)
-0:41          Function Call: texelFetch(us2M1;vi2;i1; (global 4-component vector of uint)
+0:41          textureFetch (global 4-component vector of uint)
 0:41            'usms' (uniform usampler2DMS)
 0:41            'p2' (flat in 2-component vector of int)
 0:41            Constant:
@@ -80,14 +80,14 @@ ERROR: node is still EOpNull!
 0:42      Sequence
 0:42        move second child to first child (temp 4-component vector of float)
 0:42          't41' (temp 4-component vector of float)
-0:42          Function Call: texelFetch(sA2M1;vi3;i1; (global 4-component vector of float)
+0:42          textureFetch (global 4-component vector of float)
 0:42            'smsa' (uniform sampler2DMSArray)
 0:42            'p3' (flat in 3-component vector of int)
 0:42            'samp' (flat in int)
 0:43      Sequence
 0:43        move second child to first child (temp 4-component vector of int)
 0:43          't42' (temp 4-component vector of int)
-0:43          Function Call: texelFetch(isA2M1;vi3;i1; (global 4-component vector of int)
+0:43          textureFetch (global 4-component vector of int)
 0:43            'ismsa' (uniform isampler2DMSArray)
 0:43            Constant:
 0:43              2 (const int)
@@ -97,7 +97,7 @@ ERROR: node is still EOpNull!
 0:44      Sequence
 0:44        move second child to first child (temp 4-component vector of uint)
 0:44          't43' (temp 4-component vector of uint)
-0:44          Function Call: texelFetch(usA2M1;vi3;i1; (global 4-component vector of uint)
+0:44          textureFetch (global 4-component vector of uint)
 0:44            'usmsa' (uniform usampler2DMSArray)
 0:44            'p3' (flat in 3-component vector of int)
 0:44            'samp' (flat in int)
@@ -143,51 +143,51 @@ ERROR: node is still EOpNull!
 0:33      Sequence
 0:33        move second child to first child (temp 2-component vector of int)
 0:33          't11' (temp 2-component vector of int)
-0:33          Function Call: textureSize(s2M1; (global 2-component vector of int)
+0:33          textureSize (global 2-component vector of int)
 0:33            'sms' (uniform sampler2DMS)
 0:34      Sequence
 0:34        move second child to first child (temp 2-component vector of int)
 0:34          't12' (temp 2-component vector of int)
-0:34          Function Call: textureSize(is2M1; (global 2-component vector of int)
+0:34          textureSize (global 2-component vector of int)
 0:34            'isms' (uniform isampler2DMS)
 0:35      Sequence
 0:35        move second child to first child (temp 2-component vector of int)
 0:35          't13' (temp 2-component vector of int)
-0:35          Function Call: textureSize(us2M1; (global 2-component vector of int)
+0:35          textureSize (global 2-component vector of int)
 0:35            'usms' (uniform usampler2DMS)
 0:36      Sequence
 0:36        move second child to first child (temp 3-component vector of int)
 0:36          't21' (temp 3-component vector of int)
-0:36          Function Call: textureSize(sA2M1; (global 3-component vector of int)
+0:36          textureSize (global 3-component vector of int)
 0:36            'smsa' (uniform sampler2DMSArray)
 0:37      Sequence
 0:37        move second child to first child (temp 3-component vector of int)
 0:37          't22' (temp 3-component vector of int)
-0:37          Function Call: textureSize(isA2M1; (global 3-component vector of int)
+0:37          textureSize (global 3-component vector of int)
 0:37            'ismsa' (uniform isampler2DMSArray)
 0:38      Sequence
 0:38        move second child to first child (temp 3-component vector of int)
 0:38          't23' (temp 3-component vector of int)
-0:38          Function Call: textureSize(usA2M1; (global 3-component vector of int)
+0:38          textureSize (global 3-component vector of int)
 0:38            'usmsa' (uniform usampler2DMSArray)
 0:39      Sequence
 0:39        move second child to first child (temp 4-component vector of float)
 0:39          't31' (temp 4-component vector of float)
-0:39          Function Call: texelFetch(s2M1;vi2;i1; (global 4-component vector of float)
+0:39          textureFetch (global 4-component vector of float)
 0:39            'sms' (uniform sampler2DMS)
 0:39            'p2' (flat in 2-component vector of int)
 0:39            'samp' (flat in int)
 0:40      Sequence
 0:40        move second child to first child (temp 4-component vector of int)
 0:40          't32' (temp 4-component vector of int)
-0:40          Function Call: texelFetch(is2M1;vi2;i1; (global 4-component vector of int)
+0:40          textureFetch (global 4-component vector of int)
 0:40            'isms' (uniform isampler2DMS)
 0:40            'p2' (flat in 2-component vector of int)
 0:40            'samp' (flat in int)
 0:41      Sequence
 0:41        move second child to first child (temp 4-component vector of uint)
 0:41          't33' (temp 4-component vector of uint)
-0:41          Function Call: texelFetch(us2M1;vi2;i1; (global 4-component vector of uint)
+0:41          textureFetch (global 4-component vector of uint)
 0:41            'usms' (uniform usampler2DMS)
 0:41            'p2' (flat in 2-component vector of int)
 0:41            Constant:
@@ -195,14 +195,14 @@ ERROR: node is still EOpNull!
 0:42      Sequence
 0:42        move second child to first child (temp 4-component vector of float)
 0:42          't41' (temp 4-component vector of float)
-0:42          Function Call: texelFetch(sA2M1;vi3;i1; (global 4-component vector of float)
+0:42          textureFetch (global 4-component vector of float)
 0:42            'smsa' (uniform sampler2DMSArray)
 0:42            'p3' (flat in 3-component vector of int)
 0:42            'samp' (flat in int)
 0:43      Sequence
 0:43        move second child to first child (temp 4-component vector of int)
 0:43          't42' (temp 4-component vector of int)
-0:43          Function Call: texelFetch(isA2M1;vi3;i1; (global 4-component vector of int)
+0:43          textureFetch (global 4-component vector of int)
 0:43            'ismsa' (uniform isampler2DMSArray)
 0:43            Constant:
 0:43              2 (const int)
@@ -212,7 +212,7 @@ ERROR: node is still EOpNull!
 0:44      Sequence
 0:44        move second child to first child (temp 4-component vector of uint)
 0:44          't43' (temp 4-component vector of uint)
-0:44          Function Call: texelFetch(usA2M1;vi3;i1; (global 4-component vector of uint)
+0:44          textureFetch (global 4-component vector of uint)
 0:44            'usmsa' (uniform usampler2DMSArray)
 0:44            'p3' (flat in 3-component vector of int)
 0:44            'samp' (flat in int)