[llvm] [CodeGen] Correctly handle non-standard cases in RemoveLoadsIntoFakeUses (PR #111551)

[Jeremy Morse via llvm-commits]

https://github.com/jmorse commented:

This soft-LGTM, with the caveat about the correct method for testing for instr-ref and (alas) needing to test for it. (Probably just wants another RUN line?).

https://github.com/llvm/llvm-project/pull/111551