Apply suggestions from code review

Co-authored-by: Yingwei Zheng <[email protected]>

Author: jrbyrnes

llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp

@@ -3662,17 +3662,15 @@ Instruction *InstCombinerImpl::visitOr(BinaryOperator &I) {
 
       if (LHSDecompose && RHSDecompose && LHSDecompose->X == RHSDecompose->X &&
           (ICmpInst::isEquality(LHSDecompose->Pred)) &&
-          !RHSDecompose->Mask.isNegative() &&
-          !LHSDecompose->Mask.isNegative() && RHSDecompose->Mask.isPowerOf2() &&
+         RHSDecompose->Mask.isPowerOf2() &&
           LHSDecompose->Mask.isPowerOf2() &&
-          LHSDecompose->Mask != RHSDecompose->Mask &&
-          LHSDecompose->C.isZero() && RHSDecompose->C.isZero()) {
+          LHSDecompose->Mask != RHSDecompose->Mask) {
         if (LHSDecompose->Pred == ICmpInst::ICMP_NE)
           std::swap(Op0Eq, Op0Ne);
         if (RHSDecompose->Pred == ICmpInst::ICMP_NE)
           std::swap(Op1Eq, Op1Ne);
 
-        if (Op0Ne->isStrictlyPositive() && Op1Ne->isStrictlyPositive() &&
+        if (!Op0Ne->isZero() && !Op1Ne->isZero() &&
             Op0Eq->isZero() && Op1Eq->isZero() &&
             Op0Ne->urem(LHSDecompose->Mask).isZero() &&
             Op1Ne->urem(RHSDecompose->Mask).isZero() &&