[lld] [llvm] [lld][AArch64][Build Attributes] Add support for AArch64 Build Attributes (PR #147970)

[Mark Murray via llvm-commits]

MarkMurrayARM wrote:

I have addressed alll review comments in https://github.com/llvm/llvm-project/pull/144082, except for https://github.com/llvm/llvm-project/pull/144082#discussion_r2185998921

https://github.com/llvm/llvm-project/pull/147970