[llvm] [InstCombine] Improve range computation in `foldICmpAddConstant` (PR #155096)

[Yingwei Zheng's bot via llvm-commits]

zyw-bot wrote:

Invalid command. Avaiable commands:
[AT]zyw-bot csmith-quick-fuzz run stress testing on a small, distilled corpus. (~4min)
[AT]zyw-bot csmith-fuzz       run stress testing on a larger corpus generated by csmith. (~100min)
[AT]zyw-bot mfuzz             run mutation-based testing with Alive2. (~5min)
                              Please make sure that this patch has enough triggering tests.


https://github.com/llvm/llvm-project/pull/155096