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

[Tomas Matheson via llvm-commits]

https://github.com/tmatheson-arm commented:

Thanks for adding the test. Unfortunately because it looks invalid to me, I still don't understand what the user facing problem is. Can you give a clang driver command line + C file that exhibits it?

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