[llvm] getelementptr inbounds clarifications (PR #65478)

[Ralf Jung via llvm-commits]

RalfJung wrote:

I'm now receiving a bunch of scary-sounding emails:
"Buildbot failure in LLVM Buildbot on flang-aarch64-out-of-tree"
"Buildbot failure in LLVM Buildbot on sanitizer-x86_64-linux-qemu"
"Buildbot failure in LLVM Buildbot on clang-s390x-linux"
Is it safe for me to ignore them...?

https://github.com/llvm/llvm-project/pull/65478