[SCEV][NFC] Simplify check with CI->isZero() exit condition

Replace check with
    if ((ExitIfTrue && CI->isZero()) || (!ExitIfTrue && CI->isOne()))
with equivalent and simpler version
    if (ExitIfTrue == CI->isZero())

Author: xortator

llvm/lib/Analysis/ScalarEvolution.cpp

@@ -7829,7 +7829,7 @@ ScalarEvolution::computeBackedgeTakenCount(const Loop *L,
     if (auto *BI = dyn_cast<BranchInst>(ExitBB->getTerminator()))
       if (auto *CI = dyn_cast<ConstantInt>(BI->getCondition())) {
         bool ExitIfTrue = !L->contains(BI->getSuccessor(0));
-        if ((ExitIfTrue && CI->isZero()) || (!ExitIfTrue && CI->isOne()))
+        if (ExitIfTrue == CI->isZero())
           continue;
       }