[clang] [flang] [mlir] [flang] Retry add basic -mtune support (PR #96688)

[Tobias Gysi via cfe-commits]

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+; RUN: mlir-translate -import-llvm -split-input-file %s | FileCheck %s
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gysit wrote:

> To me, it would make sense if mlir-translate didn't care - it doesn't have to interpret these attributes, does it?

It doesn't do anything with them except for running the LLVM verifier. If things pass on Aarch64, then the guards are not necessary. 

https://github.com/llvm/llvm-project/pull/96688