[llvm] [MachineLICM][AArch64] Hoist COPY instructions with other uses in the loop (PR #71403)

[Jay Foad via llvm-commits]

jayfoad wrote:

> Adding some AMD reviewers to check these test changes look OK

Thanks. @dstutt @piotrAMD @ritson FYI.

https://github.com/llvm/llvm-project/pull/71403