[llvm-branch-commits] [llvm] release/19.x: [AArch64] Don't replace dst of SWP instructions with (X|W)ZR (#102139) (PR #102316)

[Simon Tatham via llvm-branch-commits]

https://github.com/statham-arm approved this pull request.

Seems sensible to me. It's fixing a genuine codegen fault (a subtle one, but of course that makes it worse – harder to spot when it occurs!). And it's a small safe change that disables one very small case of a conceptually simple optimisation, unlikely to introduce other bugs.

https://github.com/llvm/llvm-project/pull/102316