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

[Matthias Braun via cfe-commits]

MatzeB wrote:

I submitted this fix after seeing this line: https://github.com/llvm/llvm-project/blob/main/llvm/lib/TargetParser/AArch64TargetParser.cpp#L368   which looks like the function intends to handle negative features.

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