[llvm] [AArch64] Refactor and move common code to `AArch64PrologueEpilogue` (NFCI) (PR #158920)

[Sander de Smalen via llvm-commits]

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@@ -94,24 +137,16 @@ class AArch64PrologueEmitter {
   // emitFramePointerSetup.
   bool EmitCFI = false;
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sdesmalen-arm wrote:

Can EmitCFI and IsFunclet also be moved to the AArch64PrologueEpilogueCommon class?

https://github.com/llvm/llvm-project/pull/158920