[OpenACC][NFC] Refactor SemaOpenACC to use a visitor

This code was getting unwieldy, so a quick patch to refactor it a bit.

clang/include/clang/AST/OpenACCClause.h

@@ -867,7 +867,7 @@ public:
   case OpenACCClauseKind::CLAUSE_NAME:                                         \
     Visit##CLAUSE_NAME##Clause(*cast<OpenACC##CLAUSE_NAME##Clause>(C));        \
     return;
-#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)                                  \
+#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, DEPRECATED)                      \
   case OpenACCClauseKind::ALIAS_NAME:                                          \
     Visit##CLAUSE_NAME##Clause(*cast<OpenACC##CLAUSE_NAME##Clause>(C));        \
     return;

clang/include/clang/Basic/OpenACCClauses.def

@@ -15,31 +15,31 @@
 //
 // VISIT_CLAUSE(CLAUSE_NAME)
 //
-// CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)
+// CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, DEPRECATED)
 
 #ifndef CLAUSE_ALIAS
-#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)
+#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, false)
 #endif
 
 VISIT_CLAUSE(Auto)
 VISIT_CLAUSE(Async)
 VISIT_CLAUSE(Attach)
 VISIT_CLAUSE(Copy)
-CLAUSE_ALIAS(PCopy, Copy)
-CLAUSE_ALIAS(PresentOrCopy, Copy)
+CLAUSE_ALIAS(PCopy, Copy, true)
+CLAUSE_ALIAS(PresentOrCopy, Copy, true)
 VISIT_CLAUSE(CopyIn)
-CLAUSE_ALIAS(PCopyIn, CopyIn)
-CLAUSE_ALIAS(PresentOrCopyIn, CopyIn)
+CLAUSE_ALIAS(PCopyIn, CopyIn, true)
+CLAUSE_ALIAS(PresentOrCopyIn, CopyIn, true)
 VISIT_CLAUSE(CopyOut)
-CLAUSE_ALIAS(PCopyOut, CopyOut)
-CLAUSE_ALIAS(PresentOrCopyOut, CopyOut)
+CLAUSE_ALIAS(PCopyOut, CopyOut, true)
+CLAUSE_ALIAS(PresentOrCopyOut, CopyOut, true)
 VISIT_CLAUSE(Create)
-CLAUSE_ALIAS(PCreate, Create)
-CLAUSE_ALIAS(PresentOrCreate, Create)
+CLAUSE_ALIAS(PCreate, Create, true)
+CLAUSE_ALIAS(PresentOrCreate, Create, true)
 VISIT_CLAUSE(Default)
 VISIT_CLAUSE(DevicePtr)
 VISIT_CLAUSE(DeviceType)
-CLAUSE_ALIAS(DType, DeviceType)
+CLAUSE_ALIAS(DType, DeviceType, false)
 VISIT_CLAUSE(FirstPrivate)
 VISIT_CLAUSE(If)
 VISIT_CLAUSE(Independent)

clang/lib/AST/OpenACCClause.cpp

@@ -104,7 +104,7 @@ OpenACCClause::child_range OpenACCClause::children() {
 #define VISIT_CLAUSE(CLAUSE_NAME)                                              \
   case OpenACCClauseKind::CLAUSE_NAME:                                         \
     return cast<OpenACC##CLAUSE_NAME##Clause>(this)->children();
-#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)                                  \
+#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, DEPRECATED)                      \
   case OpenACCClauseKind::ALIAS_NAME:                                          \
     return cast<OpenACC##CLAUSE_NAME##Clause>(this)->children();