[llvm] ARM: Don't duplicate the LR def when expanding call pseudos (PR #225062)

[David Green via llvm-commits]

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

If you can avoid the implicit def through BuildMI (or a new method) then that sounds cleaner, but otherwise LGTM.

https://github.com/llvm/llvm-project/pull/225062