[OPENMP50]Add 'depobj' modifier in 'depend' clauses.

Added basic support (parsing/sema/serialization) for depobj dependency
kind in depend clauses.
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 27b88b3..1da884f 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -3198,9 +3198,7 @@
   Data.RLoc = Tok.getLocation();
   if (!T.consumeClose())
     Data.RLoc = T.getCloseLocation();
-  return (Kind == OMPC_depend && Data.ExtraModifier != OMPC_DEPEND_unknown &&
-          Vars.empty()) ||
-         (Kind != OMPC_depend && Kind != OMPC_map && Vars.empty()) ||
+  return (Kind != OMPC_depend && Kind != OMPC_map && Vars.empty()) ||
          (MustHaveTail && !Data.TailExpr) || InvalidReductionId ||
          IsInvalidMapperModifier;
 }