!fixup address comments, thanks

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -10129,7 +10129,7 @@ preparePlanForEpilogueVectorLoop(VPlan &Plan, Loop *L,
     } else {
       // Retrieve the induction resume values for wide inductions from
       // their original phi nodes in the scalar loop.
-      PHINode *IndPhi = dyn_cast<VPWidenInductionRecipe>(&R)->getPHINode();
+      PHINode *IndPhi = cast<VPWidenInductionRecipe>(&R)->getPHINode();
       // Hook up to the PHINode generated by a ResumePhi recipe of main
       // loop VPlan, which feeds the scalar loop.
       ResumeV = IndPhi->getIncomingValueForBlock(L->getLoopPreheader());