[clang] [flang] [llvm] Re-land: "[AArch64] Add ability to list extensions enabled for a target" (#95805) (PR #96795)

[Jonathan Thackray via cfe-commits]

https://github.com/jthackray commented:

LGTM so far. Just a couple of minor comments.

https://github.com/llvm/llvm-project/pull/96795