[lld] [LLD][MinGW] Support machine:arm64x when invoked in MinGW mode. (PR #145343)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

Before this is merged, please turn off the [Keep my email addresses private](https://github.com/settings/emails) setting in your account. See [LLVM Developer Policy](https://llvm.org/docs/DeveloperPolicy.html#email-addresses) and [LLVM Discourse](https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it) for more information.


https://github.com/llvm/llvm-project/pull/145343