[InstCombine] Use getAllOnesValue()

Split off from llvm/llvm-project#80309.

Author: nikic

llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp

@@ -315,7 +315,7 @@ Instruction *InstCombinerImpl::foldCmpLoadFromIndexedGlobal(
       DL.getTypeAllocSize(Init->getType()->getArrayElementType());
   auto MaskIdx = [&](Value *Idx) {
     if (!GEP->isInBounds() && llvm::countr_zero(ElementSize) != 0) {
-      Value *Mask = ConstantInt::get(Idx->getType(), -1);
+      Value *Mask = Constant::getAllOnesValue(Idx->getType());
       Mask = Builder.CreateLShr(Mask, llvm::countr_zero(ElementSize));
       Idx = Builder.CreateAnd(Idx, Mask);
     }