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/spv.intrinsicsSpirvLiteral.vert

@@ -0,0 +1,17 @@
+#version 450 core
+
+#extension GL_EXT_spirv_intrinsics: enable
+
+spirv_instruction(id = 61)
+vec4 load(spirv_by_reference vec4 pointer, spirv_literal int memoryOperands);
+
+spirv_instruction(id = 62)
+void store(spirv_by_reference vec4 pointer, vec4 object, spirv_literal int memoryOperands);
+
+layout(location = 0) in vec4 vec4In;
+layout(location = 1) out vec4 vec4Out;
+
+void main()
+{
+    store(vec4Out, load(vec4In, /*None=*/0x0), /*Volatile=*/0x1);
+}