[clang] [llvm] Reland "[AArch64] Decouple feature dependency expansion. (#94279)" (PR #95231)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Probably unexpected. With older Clang versions, the `"target-features"` attribute contains `,+outline-atomics,+v8a,-fmv`, which is now missing.
The lack of `v8a` and `outline-atomics` causes `veorq_u64` rejection.

https://github.com/llvm/llvm-project/pull/95231