[llvm] [AArch64] Initial compiler support for SVE unwind on Windows. (PR #138609)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

Those two crashes are the ones I've seen, yes, and are addressed by the hack.

The issue is that the projects detect SVE without debug info, then try to build with debug info?

So... I have the following options here right now:

- Add a temporary disabled-by-default flag for SVE on Windows, so projects can't detect the SVE support.
- Add some form of debug info hack: either intentionally add incorrect mappings, or somehow drop the bits of debug info that would depend on those mappings.

Longer-term, we're reaching out to Microsoft for more information here, but not sure how long that will take.

https://github.com/llvm/llvm-project/pull/138609