[clang] Patch series to reapply #118734 and substantially improve it (PR #120534)

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dyung wrote:

> I think I've addressed most of the review comments here at this point.
> 
> But maybe most excitingly, I think the latest version may dodge the issues that have cropped up with MSVC -- both LoongArch and X86 fixes have been incorporated that hopefully help. @dyung -- if you can try it out, let me know.

Sure, I can test it. Just to confirm, what branch/commit should I be testing?



https://github.com/llvm/llvm-project/pull/120534