diff --git a/llvm/lib/Transforms/Scalar/GVNSink.cpp b/llvm/lib/Transforms/Scalar/GVNSink.cpp
--- a/llvm/lib/Transforms/Scalar/GVNSink.cpp
+++ b/llvm/lib/Transforms/Scalar/GVNSink.cpp
@@ -779,11 +779,11 @@
 
   unsigned NumOrigPreds = Preds.size();
   // We can only sink instructions through unconditional branches.
-  for (auto I = Preds.begin(); I != Preds.end();) {
-    if ((*I)->getTerminator()->getNumSuccessors() != 1)
-      I = Preds.erase(I);
+  for (auto BB = Preds.begin(); BB != Preds.end();) {
+    if ((*BB)->getTerminator()->getNumSuccessors() != 1)
+      BB = Preds.erase(BB);
     else
-      ++I;
+      ++BB;
   }
 
   LockstepReverseIterator LRI(Preds);