Index: lib/Transforms/Utils/LoopUnrollPeel.cpp
===================================================================
--- lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -656,9 +656,10 @@
     LatchBR->setMetadata(LLVMContext::MD_prof, WeightNode);
   }
 
-  // If the loop is nested, we changed the parent loop, update SE.
+  // If the loop is nested, we could have changed any of its parent loops,
+  // update SE.
   if (Loop *ParentLoop = L->getParentLoop()) {
-    SE->forgetLoop(ParentLoop);
+    SE->forgetTopmostLoop(ParentLoop);
 
     // FIXME: Incrementally update loop-simplify
     simplifyLoop(ParentLoop, DT, LI, SE, AC, PreserveLCSSA);