HLSL: Fix #1432: Globally initialize local static variables.

hlsl/hlslGrammar.h

@@ -52,7 +52,7 @@ namespace glslang {
     public:
         HlslGrammar(HlslScanContext& scanner, HlslParseContext& parseContext)
             : HlslTokenStream(scanner), parseContext(parseContext), intermediate(parseContext.intermediate),
-              typeIdentifiers(false) { }
+              typeIdentifiers(false), unitNode(nullptr) { }
         virtual ~HlslGrammar() { }
 
         bool parse();
@@ -133,6 +133,7 @@ namespace glslang {
         HlslParseContext& parseContext;  // state of parsing and helper functions for building the intermediate
         TIntermediate& intermediate;     // the final product, the intermediate representation, includes the AST
         bool typeIdentifiers;            // shader uses some types as identifiers
+        TIntermNode* unitNode;
     };
 
 } // end namespace glslang