Set Changed properly after calling DeleteDeadPHIs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92735 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/LoopStrengthReduce.cpp

@@ -2723,7 +2723,7 @@ bool LoopStrengthReduce::runOnLoop(Loop *L, LPPassManager &LPM) {
 
   // At this point, it is worth checking to see if any recurrence PHIs are also
   // dead, so that we can remove them as well.
-  DeleteDeadPHIs(L->getHeader());
+  Changed |= DeleteDeadPHIs(L->getHeader());
 
   return Changed;
 }