[llvm] [X86] Fix RegAlloc issue by implementing TRI::getCustomEHPadPreservedMask (PR #135518)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

Maybe someone from @llvm/pr-subscribers-backend-arm can help with the review? IIUC SJLJ-style exception handling is the default on ARM-Darwin.


https://github.com/llvm/llvm-project/pull/135518