[lld] [LLD][ELF][AArch64] Add support for SHF_AARCH64_PURECODE ELF section flag (3/3) (PR #125689)

[Peter Smith via llvm-commits]

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https://github.com/smithp35 approved this pull request.

Test case looks good to me. I think the generic parts of the BTI insertion are already tested in aarch64-thunk-bti.s , leaving the execute-only specific parts here.

As you don't have permission to merge, I'll leave that for MaskRay once he's happy with the changes.

https://github.com/llvm/llvm-project/pull/125689