[llvm-branch-commits] [llvm] [AArch64][PAC] Rework the expansion of AUT/AUTPAC pseudos (PR #169699)

[Anatoly Trosinenko via llvm-branch-commits]

atrosinenko wrote:

The original patch was rather complex and hard to review. Now I factored out a preliminary NFC change that groups the operands of `emitPtrauthAuthResign` method (#174002) and opened a separate PR that adds `@earlyclobber` to the `$Scratch` operand of `AUTxMxN` (#173999).

https://github.com/llvm/llvm-project/pull/169699