[llvm] [AArch64] set AppleA14 architecture version to v8.5-a (PR #92600)

[via llvm-commits]

AtariDreams wrote:

Said document also says M1 and A14 don't have the BTI feature that guards against execution of instructions that are not the intended target of a branch

https://github.com/llvm/llvm-project/pull/92600