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

[Benjamin Maxwell via llvm-commits]

https://github.com/MacDue commented:

I think this mostly looks okay (I can't spot anything broken :slightly_smiling_face: -- but this is pretty tricky code). It is missing some of the testing we have for the non-Windows code path, e.g., https://github.com/llvm/llvm-project/blob/main/llvm/test/CodeGen/AArch64/framelayout-sve.mir, which includes tests with fixed-stack objects (which I don't think are tested by `win-sve.ll`). It may be worth making some equivalent tests for Windows.

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