[lld] [llvm] [readobj][Arm][AArch64] Refactor Build Attributes parsing under ELFAtributeParser and add support for AArch64 Build Attributes (PR #128727)

[Oliver Stannard via llvm-commits]

https://github.com/ostannard commented:

This is another PR with multiple logical changes in a single large patch, it would have been easier to review if split up appropriately. I think there are three changes here:
* Rename `AArch64BuildAttrs` to `AArch64BuildAttributes` (NFC)
* Split out the existing code into `ELFAttrParserCompact` (NFC)
* Add `ELFAttrParserExtended`, and use it for AArch64

https://github.com/llvm/llvm-project/pull/128727