!fixup remove dead checks.

Author: fhahn

llvm/lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -808,9 +808,7 @@ static bool isLoopCounter(PHINode* Phi, Loop *L,
     return false;
 
   const SCEV *S = SE->getSCEV(Phi);
-  if (!match(S,
-             m_scev_AffineAddRec(m_SCEV(), m_scev_One(), m_SpecificLoop(L))) ||
-      cast<SCEVAddRecExpr>(S)->getLoop() != L)
+  if (!match(S, m_scev_AffineAddRec(m_SCEV(), m_scev_One(), m_SpecificLoop(L))))
     return false;
 
   int LatchIdx = Phi->getBasicBlockIndex(L->getLoopLatch());