Index: llvm/trunk/include/llvm/ADT/IntervalMap.h
===================================================================
--- llvm/trunk/include/llvm/ADT/IntervalMap.h
+++ llvm/trunk/include/llvm/ADT/IntervalMap.h
@@ -964,7 +964,7 @@
 
 private:
   // The root data is either a RootLeaf or a RootBranchData instance.
-  AlignedCharArrayUnion<RootLeaf, RootBranchData> data;
+  LLVM_ALIGNAS(RootLeaf) AlignedCharArrayUnion<RootLeaf, RootBranchData> data;
 
   // Tree height.
   // 0: Leaves in root.