[lld] [llvm] [lld][AArch64][Build Attributes] Add support for converting AArch64 Build Attributes to GNU Properties (PR #131990)

[Peter Smith via llvm-commits]

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+// This file replace gnu properties with aarch64 build attributes.
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smithp35 wrote:

The preferred way to use additional files in LLD is to use `split-file` and put the contents into the test .s file. That way all the inputs for the test are visible in one place. Search for `split-file` in the other tests to get some examples.

I'd also not say replace gnu properties with aarch64 build attributes. Taken on its own this is just a file that exclusively uses aarch64 build attributes. I suggest rewording to
```
Declare file properties exclusively with aarch64 build attributes.
```


https://github.com/llvm/llvm-project/pull/131990