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/Include/BaseTypes.h

@@ -65,6 +65,10 @@ enum TBasicType {
     EbtAccStruct,
     EbtReference,
     EbtRayQuery,
+#ifndef GLSLANG_WEB
+    // SPIR-V type defined by spirv_type
+    EbtSpirvType,
+#endif
 
     // HLSL types that live only temporarily.
     EbtString,
@@ -91,6 +95,9 @@ enum TStorageQualifier {
     EvqUniform,       // read only, shared with app
     EvqBuffer,        // read/write, shared with app
     EvqShared,        // compute shader's read/write 'shared' qualifier
+#ifndef GLSLANG_WEB
+    EvqSpirvStorageClass, // spirv_storage_class
+#endif
 
     EvqPayload,
     EvqPayloadIn,
@@ -321,6 +328,9 @@ __inline const char* GetStorageQualifierString(TStorageQualifier q)
     case EvqGlobal:         return "global";         break;
     case EvqConst:          return "const";          break;
     case EvqConstReadOnly:  return "const (read only)"; break;
+#ifndef GLSLANG_WEB
+    case EvqSpirvStorageClass: return "spirv_storage_class"; break;
+#endif
     case EvqVaryingIn:      return "in";             break;
     case EvqVaryingOut:     return "out";            break;
     case EvqUniform:        return "uniform";        break;