Move overflow_underflow_toinf_0 from runtests to gtest

gtest is the preferred framework for simple tests that don't require
passing special command-line options to glslang.

Test/baseResults/overflow_underflow_toinf_0.frag.out

@@ -26,3 +26,34 @@ Shader version: 320
 0:?   Linker Objects
 0:?     'my_FragColor' ( out highp 4-component vector of float)
 
+
+Linked fragment stage:
+
+
+Shader version: 320
+0:? Sequence
+0:4  Function Definition: main( ( global void)
+0:4    Function Parameters: 
+0:9    Sequence
+0:9      Sequence
+0:9        move second child to first child ( temp highp float)
+0:9          'correct' ( temp highp float)
+0:9          Constant:
+0:9            1.000000
+0:10      Sequence
+0:10        move second child to first child ( temp highp float)
+0:10          'correct1' ( temp highp float)
+0:10          Constant:
+0:10            1.000000
+0:11      move second child to first child ( temp highp 4-component vector of float)
+0:11        'my_FragColor' ( out highp 4-component vector of float)
+0:11        Construct vec4 ( temp highp 4-component vector of float)
+0:11          Constant:
+0:11            0.000000
+0:11          'correct' ( temp highp float)
+0:11          'correct1' ( temp highp float)
+0:11          Constant:
+0:11            1.000000
+0:?   Linker Objects
+0:?     'my_FragColor' ( out highp 4-component vector of float)
+

Test/runtests

@@ -343,8 +343,6 @@ run --enhanced-msgs -V --target-env vulkan1.2 --amb --aml enhanced.7.vert enhanc
 diff -b $BASEDIR/enhanced.7.link.out $TARGETDIR/enhanced.7.link.out || HASERROR=1
 run --enhanced-msgs -V --target-env vulkan1.2 --amb --aml spv.textureError.frag > $TARGETDIR/spv.textureError.frag.out
 diff -b $BASEDIR/spv.textureError.frag.out $TARGETDIR/spv.textureError.frag.out || HASERROR=1
-run -i overflow_underflow_toinf_0.frag > $TARGETDIR/overflow_underflow_toinf_0.out
-diff -b $BASEDIR/overflow_underflow_toinf_0.out $TARGETDIR/overflow_underflow_toinf_0.out || HASERROR=1
 
 #
 # Final checking

gtests/AST.FromFile.cpp

@@ -301,6 +301,7 @@ INSTANTIATE_TEST_SUITE_P(
         "coord_conventions.frag",
         "gl_FragCoord.frag",
         "glsl.interpOp.error.frag",
+        "overflow_underflow_toinf_0.frag",
     })),
     FileNameAsCustomTestSuffix
 );