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.

glslang/CMakeLists.txt

@@ -73,6 +73,7 @@ set(MACHINEINDEPENDENT_SOURCES
     MachineIndependent/RemoveTree.cpp
     MachineIndependent/Scan.cpp
     MachineIndependent/ShaderLang.cpp
+    MachineIndependent/SpirvIntrinsics.cpp
     MachineIndependent/SymbolTable.cpp
     MachineIndependent/Versions.cpp
     MachineIndependent/intermOut.cpp
@@ -160,6 +161,7 @@ set(GLSLANG_HEADERS
     Include/PoolAlloc.h
     Include/ResourceLimits.h
     Include/ShHandle.h
+    Include/SpirvIntrinsics.h
     Include/Types.h)
 
 add_library(glslang ${LIB_TYPE} ${BISON_GLSLParser_OUTPUT_SOURCE} ${GLSLANG_SOURCES} ${GLSLANG_HEADERS})