[clang-tools-extra] [clang] [llvm] [Clang] Fix linker error for function multiversioning (PR #71706)

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DanielKristofKiss wrote:

I proposed a change to the aarch64 spec to help the harmonisation. 
https://github.com/ARM-software/acle/pull/277

I'd drop the aarch64 specifics. I have a few more lines to make it work on aarch64 (e.g. AppendTargetVersionMangling and AppendTargetClonesMangling needs do the the .default mangling )




https://github.com/llvm/llvm-project/pull/71706