Index: include/llvm/Analysis/LoopInfoImpl.h
===================================================================
--- include/llvm/Analysis/LoopInfoImpl.h
+++ include/llvm/Analysis/LoopInfoImpl.h
@@ -87,7 +87,9 @@
   // within the loop.
   SmallVector<BlockT *, 4> ExitBlocks;
   getExitBlocks(ExitBlocks);
-  for (BlockT *EB : ExitBlocks)
+  SmallPtrSet<BlockT *, 4> UniqExitBlocks;
+  UniqExitBlocks.insert(ExitBlocks.begin(), ExitBlocks.end());
+  for (BlockT *EB : UniqExitBlocks)
     for (BlockT *Predecessor : children<Inverse<BlockT *>>(EB))
       if (!contains(Predecessor))
         return false;