[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 `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/4380

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: MC/M68k/Data/Classes/MxMoveSR.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple=m68k -mcpu=M68000 -show-encoding /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/MC/M68k/Data/Classes/MxMoveSR.s | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/MC/M68k/Data/Classes/MxMoveSR.s
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple=m68k -mcpu=M68000 -show-encoding /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/MC/M68k/Data/Classes/MxMoveSR.s
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/MC/M68k/Data/Classes/MxMoveSR.s
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/MC/M68k/Data/Classes/MxMoveSR.s:8:15: error: CHECK-SAME: expected string not found in input
; CHECK-SAME: encoding: [0x40,0xc1]
              ^
<stdin>:4:17: note: scanning from here
 move.w %sr, %d1 ; encoding: [0x32,0x00]
                ^
<stdin>:4:20: note: possible intended match here
 move.w %sr, %d1 ; encoding: [0x32,0x00]
                   ^

Input file: <stdin>
Check file: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/MC/M68k/Data/Classes/MxMoveSR.s

-dump-input=help explains the following input dump.

Input was:
<<<<<<
          1:  
          2:  move.w %d1, %sr ; encoding: [0x46,0xc1] 
          3:  
          4:  move.w %sr, %d1 ; encoding: [0x32,0x00] 
same:8'0                     X~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
same:8'1                        ?                      possible intended match
>>>>>>

--

********************


```

</details>

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