[OpenMP][NFCI] Move OpenMP clause information to lib/Frontend/OpenMP

This is a cleanup and normalization patch that also enables reuse with
Flang later on. A follow up will clean up and move the directive ->
clauses mapping.

Reviewed By: fghanim

Differential Revision: https://reviews.llvm.org/D77112

Author: jdoerfert

clang/include/clang/AST/ASTFwd.h

@@ -27,8 +27,8 @@ class Type;
 #include "clang/AST/TypeNodes.inc"
 class CXXCtorInitializer;
 class OMPClause;
-#define OPENMP_CLAUSE(KIND, CLASSNAME) class CLASSNAME;
-#include "clang/Basic/OpenMPKinds.def"
+#define OMP_CLAUSE_CLASS(Enum, Str, Class) class Class;
+#include "llvm/Frontend/OpenMP/OMPKinds.def"
 
 
 } // end namespace clang

clang/include/clang/AST/ASTTypeTraits.h

@@ -148,8 +148,8 @@ class ASTNodeKind {
 #define TYPE(DERIVED, BASE) NKI_##DERIVED##Type,
 #include "clang/AST/TypeNodes.inc"
     NKI_OMPClause,
-#define OPENMP_CLAUSE(TextualSpelling, Class) NKI_##Class,
-#include "clang/Basic/OpenMPKinds.def"
+#define OMP_CLAUSE_CLASS(Enum, Str, Class) NKI_##Class,
+#include "llvm/Frontend/OpenMP/OMPKinds.def"
     NKI_NumberOfKinds
   };
 
@@ -204,8 +204,8 @@ KIND_TO_KIND_ID(OMPClause)
 #include "clang/AST/StmtNodes.inc"
 #define TYPE(DERIVED, BASE) KIND_TO_KIND_ID(DERIVED##Type)
 #include "clang/AST/TypeNodes.inc"
-#define OPENMP_CLAUSE(TextualSpelling, Class) KIND_TO_KIND_ID(Class)
-#include "clang/Basic/OpenMPKinds.def"
+#define OMP_CLAUSE_CLASS(Enum, Str, Class) KIND_TO_KIND_ID(Class)
+#include "llvm/Frontend/OpenMP/OMPKinds.def"
 #undef KIND_TO_KIND_ID
 
 inline raw_ostream &operator<<(raw_ostream &OS, ASTNodeKind K) {