[OPENMP50]Add support for parallel master taskloop simd directive.

Added full support for parallel master taskloop simd directive.
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index c39d4d3..6f4abc4 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -2267,6 +2267,12 @@
   Code = serialization::STMT_OMP_PARALLEL_MASTER_TASKLOOP_DIRECTIVE;
 }
 
+void ASTStmtWriter::VisitOMPParallelMasterTaskLoopSimdDirective(
+    OMPParallelMasterTaskLoopSimdDirective *D) {
+  VisitOMPLoopDirective(D);
+  Code = serialization::STMT_OMP_PARALLEL_MASTER_TASKLOOP_SIMD_DIRECTIVE;
+}
+
 void ASTStmtWriter::VisitOMPDistributeDirective(OMPDistributeDirective *D) {
   VisitOMPLoopDirective(D);
   Code = serialization::STMT_OMP_DISTRIBUTE_DIRECTIVE;