[AArch64] Break up `AArch64FrameLowering::emitPrologue` (NFCI) (#157485) `emitPrologue` was almost 1k SLOC, with a large portion not actually related to emitting the vast majority of prologues. This patch creates a new class `AArch64PrologueEmitter` for emitting the prologue, which keeps common state/target classes as members. This makes adding methods that handle niche cases easy, and allows methods to be marked "const" when they don't redefine flags/state. With this change, the core "emitPrologue" is around 275 LOC, with cases like Windows stack probes or Swift frame pointers split into routines. This makes following the logic much easier.
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