[llvm] AtomicExpand: Allow incrementally legalizing atomicrmw (PR #103371)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> http://45.33.8.238/linux/147013/step_6.txt

This should be trivial to fix, the messages are just now in a different order 

https://github.com/llvm/llvm-project/pull/103371