Merge commit '0c5df8dbe561' from llvm.org/master into apple/master

Author: git apple-llvm automerger

llvm/lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -2268,8 +2268,8 @@ static PHINode *FindLoopCounter(Loop *L, BasicBlock *ExitingBB,
     if (BECount->getType()->isPointerTy() && !Phi->getType()->isPointerTy())
       continue;
 
-    const auto *AR = dyn_cast<SCEVAddRecExpr>(SE->getSCEV(Phi));
-    
+    const auto *AR = cast<SCEVAddRecExpr>(SE->getSCEV(Phi));
+
     // AR may be a pointer type, while BECount is an integer type.
     // AR may be wider than BECount. With eq/ne tests overflow is immaterial.
     // AR may not be a narrower type, or we may never exit.