[OPNEMP]Allow num_tasks clause in combined task-based directives.

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

llvm-svn: 374819
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 0a7958f..60be157 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -12940,6 +12940,7 @@
 }
 
 void OMPClauseReader::VisitOMPNumTasksClause(OMPNumTasksClause *C) {
+  VisitOMPClauseWithPreInit(C);
   C->setNumTasks(Record.readSubExpr());
   C->setLParenLoc(Record.readSourceLocation());
 }