[llvm] [InstSimplify] Fold `getelementptr inbounds null, idx -> null` (PR #130742)

[Luke Lau via llvm-commits]

lukel97 wrote:

Hi, I've bisected a failure on RISC-V with SPEC CPU 2017 https://github.com/llvm/llvm-project/issues/136395 to this at 5a993558c5fa52c605d984e0effdc1cd3b452476. Do you have a copy of SPEC CPU 2017 to reproduce this? I'll try and see if I can get a minimal reproducer, if not I'll try to attach the codegen diff from the patch

https://github.com/llvm/llvm-project/pull/130742