HLSL Non-Functional: Move to more robust capturing of postDecls into a qualifier.

This will prevent a possible future defect of thinking the type can be changed,
where there is a code path today that would drop that change.

hlsl/hlslGrammar.h

@@ -105,7 +105,7 @@ namespace glslang {
         bool acceptCaseLabel(TIntermNode*&);
         bool acceptDefaultLabel(TIntermNode*&);
         void acceptArraySpecifier(TArraySizes*&);
-        void acceptPostDecls(TType&);
+        void acceptPostDecls(TQualifier&);
 
         HlslParseContext& parseContext;  // state of parsing and helper functions for building the intermediate
         TIntermediate& intermediate;     // the final product, the intermediate representation, includes the AST