[clang] [AArch64][Clang] Fix linker error for function multiversioning (PR #74358)

[via cfe-commits]

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@@ -1752,8 +1754,10 @@ static void AppendTargetClonesMangling(const CodeGenModule &CGM,
   const TargetInfo &TI = CGM.getTarget();
   if (TI.getTriple().isAArch64()) {
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elizabethandrews wrote:

Can you please explain why AArch64 needs to be 'specially' handled here? I can't recall where but other targets get a .default mangling as well right? Why isn't AArch64 being handled wherever it is happening for other targets?

https://github.com/llvm/llvm-project/pull/74358