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

[Yingwei Zheng via llvm-commits]

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@@ -3708,7 +3748,12 @@ Instruction *InstCombinerImpl::foldICmpBinOpWithConstant(ICmpInst &Cmp,
   case Instruction::SRem:
     if (Instruction *I = foldICmpSRemConstant(Cmp, BO, C))
       return I;
+   [[fallthrough]]; 
+  case Instruction::URem:
----------------
dtcxzyw wrote:

Could you please add some tests?
You should add tests in the first commit. Then you should apply your code changes and show the test changes in the second commit.
Example: https://github.com/llvm/llvm-project/pull/76685/commits
**CAUTION:** Please generate check lines using `llvm/utils/update_test_checks.py`.


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