[clang][OpenMP] OMPFlushClause is synthetic, no such clause exists

Summary:
As discussed in https://reviews.llvm.org/D57112#inline-506781,
'flush' clause does not exist in the OpenMP spec, it can not be
specified, and `OMPFlushClause` class is just a helper class.

Therefore `OPENMP_CLAUSE()` in `clang/Basic/OpenMPKinds.def`
should not contain 'flush' "clause".

I have simply removed the `OPENMP_CLAUSE(flush, OMPFlushClause)`
from `clang/Basic/OpenMPKinds.def`, grepped for `OPENMP_CLAUSE`
and added `OPENMP_CLAUSE(flush, OMPFlushClause)` back to the **every**
place where `OPENMP_CLAUSE` is defined and `clang/Basic/OpenMPKinds.def`
is then included.

So as-is, this patch is a NFC. Possibly, some of these
`OPENMP_CLAUSE(flush, OMPFlushClause)` should be dropped,
i don't really know.

Test plan: `ninja check-clang`

Reviewers: ABataev

Reviewed By: ABataev

Subscribers: guansong, arphaman, cfe-commits

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D57280

llvm-svn: 352390

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 2e434a3c0e3..e411a2ad47c 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -681,6 +681,7 @@ public:
 #define OPENMP_CLAUSE(Name, Class)                        \
   LLVM_ATTRIBUTE_NOINLINE \
   OMPClause *Transform ## Class(Class *S);
+  OPENMP_CLAUSE(flush, OMPFlushClause)
 #include "clang/Basic/OpenMPKinds.def"
 
   /// Build a new qualified type given its unqualified type and type location.
@@ -3311,6 +3312,7 @@ OMPClause *TreeTransform<Derived>::TransformOMPClause(OMPClause *S) {
 #define OPENMP_CLAUSE(Name, Class)                                             \
   case OMPC_ ## Name :                                                         \
     return getDerived().Transform ## Class(cast<Class>(S));
+  OPENMP_CLAUSE(flush, OMPFlushClause)
 #include "clang/Basic/OpenMPKinds.def"
   }