Vulkan: Finish semantics for what creates spec-const-semantics.

Note: This required adding a new test mode to see the AST for vulkan tests.
This also required reworking some deeper parts of type creation, regarding
when storage qualification and constness is deduced bottom-up or dictated
top-down.

glslang/MachineIndependent/localintermediate.h

@@ -346,7 +346,6 @@ protected:
     static int getBaseAlignmentScalar(const TType&, int& size);
     bool isSpecializationOperation(const TIntermOperator&) const;
 
-
     const EShLanguage language;  // stage, known at construction time
     EShSource source;            // source language, known a bit later
     std::string entryPoint;