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/MachineIndependent/localintermediate.h

@@ -330,6 +330,8 @@ public:
         binaryDoubleOutput(false),
         subgroupUniformControlFlow(false),
         usePhysicalStorageBuffer(false),
+        spirvRequirement(nullptr),
+        spirvExecutionMode(nullptr),
         uniformLocationBase(0)
 #endif
     {
@@ -868,6 +870,15 @@ public:
 
     void setSubgroupUniformControlFlow() { subgroupUniformControlFlow = true; }
     bool getSubgroupUniformControlFlow() const { return subgroupUniformControlFlow; }
+
+    // GL_EXT_spirv_intrinsics
+    void insertSpirvRequirement(const TSpirvRequirement* spirvReq);
+    bool hasSpirvRequirement() const { return spirvRequirement != nullptr; }
+    const TSpirvRequirement& getSpirvRequirement() const { return *spirvRequirement; }
+    void insertSpirvExecutionMode(int executionMode, const TIntermAggregate* args = nullptr);
+    void insertSpirvExecutionModeId(int executionMode, const TIntermAggregate* args);
+    bool hasSpirvExecutionMode() const { return spirvExecutionMode != nullptr; }
+    const TSpirvExecutionMode& getSpirvExecutionMode() const { return *spirvExecutionMode; }
 #endif // GLSLANG_WEB
 
     void addBlockStorageOverride(const char* nameStr, TBlockStorageClass backing)
@@ -1122,6 +1133,9 @@ protected:
     bool subgroupUniformControlFlow;
     bool usePhysicalStorageBuffer;
 
+    TSpirvRequirement* spirvRequirement;
+    TSpirvExecutionMode* spirvExecutionMode;
+
     std::unordered_map<std::string, int> uniformLocationOverrides;
     int uniformLocationBase;
     TNumericFeatures numericFeatures;