[OPENMP50]Initial support for inclusive clause.

Added parsing/sema/serialization support for inclusive clause in scan
directive.
diff --git a/clang/lib/CodeGen/CGStmtOpenMP.cpp b/clang/lib/CodeGen/CGStmtOpenMP.cpp
index 37bdb53..e05829f 100644
--- a/clang/lib/CodeGen/CGStmtOpenMP.cpp
+++ b/clang/lib/CodeGen/CGStmtOpenMP.cpp
@@ -4616,6 +4616,7 @@
   case OMPC_order:
   case OMPC_destroy:
   case OMPC_detach:
+  case OMPC_inclusive:
     llvm_unreachable("Clause is not allowed in 'omp atomic'.");
   }
 }