Track which extensions were enabled or required, in the intermediate representation, for reflection of the consumer.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@26155 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/baseResults/300.frag.out

@@ -39,6 +39,7 @@ ERROR: 0:150: '' :  syntax error
 ERROR: 37 compilation errors.  No code generated.
 
 
+Shader version: 300
 ERROR: node is still EOpNull!
 0:53  Function Definition: main( (void)
 0:53    Function Parameters: 
@@ -392,4 +393,5 @@ Linked fragment stage:
 
 ERROR: Linking fragment stage: when more than one fragment shader output, all must have location qualifiers
 
+Shader version: 300