Implement the extension GL_EXT_spirv_intrinsics

- Add support of SPIR-V execution mode qualifiers.
- Add support of SPIR-V storage class qualifier.
- Add support of SPIR-V decorate qualifiers.
- Add support of SPIR-V type specifier.
- Add support of SPIR-V intruction qualifiers.
- Add support of spirv_by_reference/spirv_literal parameter qualifier.
- Add shader stage macros introduced by this extension.

Test/baseResults/spv.intrinsicsSpirvLiteral.vert.out

@@ -0,0 +1,29 @@
+spv.intrinsicsSpirvLiteral.vert
+// Module Version 10000
+// Generated by (magic number): 8000a
+// Id's are bound by 12
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Vertex 4  "main"
+                              Source GLSL 450
+                              SourceExtension  "GL_EXT_spirv_intrinsics"
+                              Name 4  "main"
+                              Name 9  "vec4Out"
+                              Name 10  "vec4In"
+                              Decorate 9(vec4Out) Location 1
+                              Decorate 10(vec4In) Location 0
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+               8:             TypePointer Function 7(fvec4)
+         4(main):           2 Function None 3
+               5:             Label
+      9(vec4Out):      8(ptr) Variable Function
+      10(vec4In):      8(ptr) Variable Function
+              11:    7(fvec4) Load 10(vec4In) None
+                              Store 9(vec4Out) 11 Volatile 
+                              Return
+                              FunctionEnd