[llvm] [M68k] implement move to and from sr (PR #111145)

[via llvm-commits]

knickish wrote:

> I'm currently looking into this error ^. `[0x40, 0xc1]` is the correct encoding for a move from SR ([PRM](https://www.nxp.com/docs/en/reference-manual/M68000PRM.pdf) page 229) and is also what I got from my local build.

@TechnoElf Is this just a formatting issue then? Are you able to reproduce/resolve this or would a revert be better?

https://github.com/llvm/llvm-project/pull/111145