[clang] [lld] [llvm] [Clang][AArch64] Remove redundant tune args to the backend (PR #146896)

[Florian Hahn via llvm-commits]

================
@@ -163,17 +163,6 @@ getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune,
   if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, Extensions))
     return false;
 
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fhahn wrote:

```suggestion
return DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, Extensions);
```

this can now just become a return I think

https://github.com/llvm/llvm-project/pull/146896