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

hlsl/hlslParseHelper.cpp

@@ -7866,6 +7866,8 @@ TVariable* HlslParseContext::declareNonArray(const TSourceLoc& loc, const TStrin
 // Returning nullptr just means there is no code to execute to handle the
 // initializer, which will, for example, be the case for constant initializers.
 //
+// Returns a subtree that accomplished the initialization.
+//
 TIntermNode* HlslParseContext::executeInitializer(const TSourceLoc& loc, TIntermTyped* initializer, TVariable* variable)
 {
     //