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

[Tomas Matheson via cfe-commits]

https://github.com/tmatheson-arm approved this pull request.

LGTM. Shame the order of the `-target-features` has to change again, but I can see why (there are non-user-visible extensions in the ExtensionInfo table now, which also need sorted).

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