[llvm] [test] Move pr73894.ll to AArch64 directory and update the target triple (PR #84269)

[via llvm-commits]

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

It would be nice to have a test that works on more architectures since I believe your original change does affect more than AArch64. But this is good enough for now to unblock the build bots, so lgtm.

https://github.com/llvm/llvm-project/pull/84269