[llvm-branch-commits] [llvm] release/20.x: [AArch64][SME] [AArch64][SME] Spill p-regs as z-regs when streaming hazards are possible (PR #126503)

[Sander de Smalen via llvm-branch-commits]

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

There is no risk in adding this to the release branch, because all functionality is hidden behind a flag. The TableGen/SubtargetEmitter.cpp change should not affect anything, because it merely emits an extra `enum class` to the `*GenSubtargetInfo.cpp` file.

https://github.com/llvm/llvm-project/pull/126503