Index: lib/Sema/SemaOpenMP.cpp
===================================================================
--- lib/Sema/SemaOpenMP.cpp
+++ lib/Sema/SemaOpenMP.cpp
@@ -123,7 +123,7 @@
           CancelRegion(false), AssociatedLoops(1), InnerTeamsRegionLoc() {}
   };
 
-  typedef SmallVector<SharingMapTy, 64> StackTy;
+  typedef SmallVector<SharingMapTy, 4> StackTy;
 
   /// \brief Stack of used declaration and their data-sharing attributes.
   StackTy Stack;