[lld] [LLD][COFF] Add support for autoimports on ARM64X (PR #129282)

[Martin Storsjö via llvm-commits]

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

LGTM, thanks! Although there's a couple details in the test comments that I'm unsure about.

https://github.com/llvm/llvm-project/pull/129282