[llvm] [M68k] Prevent COPY instruction from killing live condition flags (PR #168485)

[John Paul Adrian Glaubitz via llvm-commits]

glaubitz wrote:

@dansalvato @knickish Thanks a lot for fixing this issue! Now we just need to add support for 32-bit relocations and we can finally build rustc for m68k ;-).

https://github.com/llvm/llvm-project/pull/168485