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

[Pavel Iliin 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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ilinpv wrote:

@jroelofs currently in [FMV spec](https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning):
```
The following attributes trigger the multi version code generation: __attribute__((target_version("name"))) and __attribute__((target_clones("name",...))).
These attributes can't be mixed with each other.
```

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