[OPENMP50]Add basic support for depobj construct.

Added basic parsing/sema/serialization support for depobj directive.
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 1411171..907b4d7 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -3262,6 +3262,7 @@
   void EmitOMPTaskwaitDirective(const OMPTaskwaitDirective &S);
   void EmitOMPTaskgroupDirective(const OMPTaskgroupDirective &S);
   void EmitOMPFlushDirective(const OMPFlushDirective &S);
+  void EmitOMPDepobjDirective(const OMPDepobjDirective &S);
   void EmitOMPOrderedDirective(const OMPOrderedDirective &S);
   void EmitOMPAtomicDirective(const OMPAtomicDirective &S);
   void EmitOMPTargetDirective(const OMPTargetDirective &S);