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

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/10098

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
9.042 [39/18/21] Linking CXX executable unittests/Bitcode/BitcodeTests
9.498 [38/18/22] Linking CXX executable tools/clang/unittests/Driver/ClangDriverTests
9.738 [37/18/23] Linking CXX executable unittests/DebugInfo/BTF/DebugInfoBTFTests
10.443 [36/18/24] Linking CXX executable unittests/DebugInfo/GSYM/DebugInfoGSYMTests
11.556 [35/18/25] Linking CXX executable tools/clang/unittests/Tooling/ToolingTests
11.721 [34/18/26] Linking CXX executable unittests/DebugInfo/PDB/DebugInfoPDBTests
11.865 [33/18/27] Linking CXX executable unittests/DebugInfo/Symbolizer/DebugInfoSymbolizerTests
12.123 [32/18/28] Linking CXX executable unittests/DWARFLinkerParallel/DWARFLinkerParallelTests
12.302 [31/18/29] Linking CXX executable tools/clang/unittests/Analysis/ClangAnalysisTests
12.512 [30/18/30] Linking CXX executable unittests/Debuginfod/DebuginfodTests
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1213.586252

```

</details>

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