[clang] [COFF][Aarch64] Add _InterlockedAdd64 intrinsic (PR #81849)

[Martin Storsjö via cfe-commits]

mstorsjo wrote:

It looks like your github account is set to keep your email address private - can you please turn that off, so we get a proper email address (when the commit is rewritten, as we do merges with "squash and merge" here)? See the "keep my email addresses private" setting at https://github.com/settings/emails, and https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it for the reasoning about this.

https://github.com/llvm/llvm-project/pull/81849