[llvm] [TargetParser][AArch64] Believe runtime feature detection (PR #95694)

[via llvm-commits]

workingjubilee wrote:

@davemgreen That seems like blatant feature creep.

On the other hand, I am happy to incorporate such fixes to adjust the target feature schema for LLVM to make it more accurate if I am granted liberty to actually correct the inaccuracies.

https://github.com/llvm/llvm-project/pull/95694