[OPENMP50]Add basic support for depobj construct.

Added basic parsing/sema/serialization support for depobj directive.
diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index 238e049..a334bab 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -247,6 +247,9 @@
   case Stmt::OMPFlushDirectiveClass:
     EmitOMPFlushDirective(cast<OMPFlushDirective>(*S));
     break;
+  case Stmt::OMPDepobjDirectiveClass:
+    EmitOMPDepobjDirective(cast<OMPDepobjDirective>(*S));
+    break;
   case Stmt::OMPOrderedDirectiveClass:
     EmitOMPOrderedDirective(cast<OMPOrderedDirective>(*S));
     break;