[clang] [llvm] [AArch64TargetParser]Fix reconstructFromParsedFeatures ignoring negative features (PR #142236)

[Matthias Braun via llvm-commits]

MatzeB wrote:

Cannot test with `--print-enabled-extensions` as clang has its own logic to parse target features.

But I added a test based on the `always_inline` compatibility check logic that is close to the original issue we ran into.

https://github.com/llvm/llvm-project/pull/142236