[OPENMP]Allow priority clause in combined task-based directives.

The expression of the priority clause must be captured in the combined
task-based directives, like 'parallel master taskloop' directive.

llvm-svn: 375026
diff --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index ccb3cd3..fe13344 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -90,6 +90,8 @@
     return static_cast<const OMPNumTasksClause *>(C);
   case OMPC_final:
     return static_cast<const OMPFinalClause *>(C);
+  case OMPC_priority:
+    return static_cast<const OMPPriorityClause *>(C);
   case OMPC_default:
   case OMPC_proc_bind:
   case OMPC_safelen:
@@ -117,7 +119,6 @@
   case OMPC_threads:
   case OMPC_simd:
   case OMPC_map:
-  case OMPC_priority:
   case OMPC_nogroup:
   case OMPC_hint:
   case OMPC_defaultmap:
@@ -255,6 +256,12 @@
   return child_range(&Condition, &Condition + 1);
 }
 
+OMPClause::child_range OMPPriorityClause::used_children() {
+  if (Stmt **C = getAddrOfExprAsWritten(getPreInitStmt()))
+    return child_range(C, C + 1);
+  return child_range(&Priority, &Priority + 1);
+}
+
 OMPOrderedClause *OMPOrderedClause::Create(const ASTContext &C, Expr *Num,
                                            unsigned NumLoops,
                                            SourceLocation StartLoc,