[ConstraintElimination] Use getAllOnesValue()

Split out from #80309.

Author: nikic

llvm/lib/Transforms/Scalar/ConstraintElimination.cpp

@@ -875,7 +875,7 @@ void ConstraintInfo::transferToOtherSystem(
       addFact(CmpInst::ICMP_ULT, A, B, NumIn, NumOut, DFSInStack);
     break;
   case CmpInst::ICMP_SGT: {
-    if (doesHold(CmpInst::ICMP_SGE, B, ConstantInt::get(B->getType(), -1)))
+    if (doesHold(CmpInst::ICMP_SGE, B, Constant::getAllOnesValue(B->getType())))
       addFact(CmpInst::ICMP_UGE, A, ConstantInt::get(B->getType(), 0), NumIn,
               NumOut, DFSInStack);
     if (IsKnownNonNegative(B))