HLSL: Add min*{float,int,uint} types

These HLSL types are guaranteed to have at least the given number of bits, but may have more.

min{16,10}float is mapped to EbtFloat at medium precision -> SPIRV RelaxedPrecision
min{16,12}int and min16uint are mapped to mediump -> SPIR-V RelaxedPrecision

hlsl/hlslTokens.h

@@ -108,6 +108,26 @@ enum EHlslTokenClass {
     EHTokUint2,
     EHTokUint3,
     EHTokUint4,
+    EHTokMin16float1,
+    EHTokMin16float2,
+    EHTokMin16float3,
+    EHTokMin16float4,
+    EHTokMin10float1,
+    EHTokMin10float2,
+    EHTokMin10float3,
+    EHTokMin10float4,
+    EHTokMin16int1,
+    EHTokMin16int2,
+    EHTokMin16int3,
+    EHTokMin16int4,
+    EHTokMin12int1,
+    EHTokMin12int2,
+    EHTokMin12int3,
+    EHTokMin12int4,
+    EHTokMin16uint1,
+    EHTokMin16uint2,
+    EHTokMin16uint3,
+    EHTokMin16uint4,
 
     // matrix types
     EHTokInt1x1,