[llvm] Implement foldICmpRemConstant in InstCombineCompares (PR #77410)

[Yingwei Zheng via llvm-commits]

================
@@ -2572,6 +2572,46 @@ Instruction *InstCombinerImpl::foldICmpSRemConstant(ICmpInst &Cmp,
   return new ICmpInst(ICmpInst::ICMP_UGT, And, ConstantInt::get(Ty, SignMask));
 }
 
+Instruction *InstCombinerImpl::foldICmpRemConstant(ICmpInst &Cmp,
+                                                   BinaryOperator *Rem,
+                                                   const APInt &C) {
+  const ICmpInst::Predicate Pred = Cmp.getPredicate();
----------------
dtcxzyw wrote:

```suggestion
  assert((Rem->getOpcode() == Instruction::SRem || Rem->getOpcode() == Instruction::URem) && "Only for srem/urem!");
  const ICmpInst::Predicate Pred = Cmp.getPredicate();
```


https://github.com/llvm/llvm-project/pull/77410