[clang] Revert "[X86][clang] Lift _BitInt() supported max width." (PR #81175)

[Nikita Popov via cfe-commits]

https://github.com/nikic requested changes to this pull request.

I don't think that this makes sense, given that this has already been allowed in previous stable clang releases. That's not a step you can really take back.

> but internal compiler errors and seriously wrong code

I find your PR description very vague. Please be more specific about which ICEs and miscompilations you are concerned about (godbolt please). Is this *just* about the open alignment question, or also something else?

https://github.com/llvm/llvm-project/pull/81175