[clang] [flang] [llvm] [AArch64] Add ability to list extensions enabled for a target (PR #95805)

[Lucas Duarte Prates via cfe-commits]

pratlucas wrote:

Good catch. I also wasn't able to reproduce it locally.
I've created #96795 to re-land the changes with the updated tests.

https://github.com/llvm/llvm-project/pull/95805