[llvm] [PowerPC] Make verifier happy after peephole on MMA COPYs (PR #94321)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-hip-vega20` running on `hip-vega20-0` while building `llvm` at step 3 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/123/builds/268

Here is the relevant piece of the build log for the reference:
```
Step 3 (annotate) failure: '../llvm-zorg/zorg/buildbot/builders/annotated/hip-build.sh --jobs=' (failure)
../llvm-zorg/zorg/buildbot/builders/annotated/hip-build.sh --jobs=
 in dir /work/hip-vega20-0/clang-hip-vega20/build (timeout 1200 secs)
 watching logfiles {}
 argv: [b'../llvm-zorg/zorg/buildbot/builders/annotated/hip-build.sh', b'--jobs=']
 environment:
  BUILDBOT_BLAMELIST=[]
  BUILDBOT_BRANCH=main
  BUILDBOT_BUILDERNAME=clang-hip-vega20
  BUILDBOT_BUILDNUMBER=268
  BUILDBOT_CLOBBER=
  BUILDBOT_GOT_REVISION=7272881f30d1df4b1ff45de2abb8efad7f5b9cdf
  BUILDBOT_REVISION=480a788e4946ac7b313291f26bca19aa65d649f1
  BUILDBOT_SCHEDULER=main:clang,compiler-rt,libcxx,libcxxabi,libunwind,lld,llvm
  HIP_BLENDER_TEST_CCC_OVERRIDE_OPTIONS=x-ffast-math +-mcode-object-version=4 +-v
  HIP_BLENDER_TEST_PERF_THRESH=15
  HOME=/home/hip-vega20-0
  LANG=C.UTF-8
  LOGNAME=hip-vega20-0
  MAIL=/var/mail/hip-vega20-0
  NINJAOPT=-v
  OLDPWD=/home/hip-vega20-0/res.bad/test
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/snap/bin
  PWD=/work/hip-vega20-0/clang-hip-vega20/build
  SHELL=/bin/bash
  SHLVL=2
  SSH_CLIENT=10.1.34.141 39210 22
  SSH_CONNECTION=10.1.34.141 39210 10.216.90.123 22
  SSH_TTY=/dev/pts/0
  TERM=dumb
  USER=hip-vega20-0
  XDG_DATA_DIRS=/usr/local/share:/usr/share:/var/lib/snapd/desktop
  _=/usr/bin/buildbot-worker
 using PTY: False
++ dirname ../llvm-zorg/zorg/buildbot/builders/annotated/hip-build.sh
+ HERE=../llvm-zorg/zorg/buildbot/builders/annotated
+ . ../llvm-zorg/zorg/buildbot/builders/annotated/buildbot-helper.sh
+ set -eu
+ halt_on_failure
+ echo @@@HALT_ON_FAILURE@@@
+ setup_env
+ build_step 'Setting up the buildbot'
+ echo '@@@BUILD_STEP Setting up the buildbot@@@'
+ BUILDBOT_ROOT=/buildbot
Step 12 (Testing HIP test-suite) failure: Testing HIP test-suite (failure)
@@@BUILD_STEP Testing HIP test-suite@@@
+ ninja -v check-hip-simple
[0/1] cd /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP && /buildbot/hip-vega20-0/clang-hip-vega20/llvm/bin/llvm-lit -sv empty-hip-6.0.2.test with-fopenmp-hip-6.0.2.test saxpy-hip-6.0.2.test InOneWeekend-hip-6.0.2.test TheNextWeek-hip-6.0.2.test blender.test
-- Testing: 6 tests, 6 workers --
/usr/bin/strip: /bin/bash.stripped: Bad file descriptor
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.
FAIL: test-suite :: External/HIP/InOneWeekend-hip-6.0.2.test (5 of 6)
******************** TEST 'test-suite :: External/HIP/InOneWeekend-hip-6.0.2.test' FAILED ********************

/buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/tools/timeit-target --timeout 7200 --limit-core 0 --limit-cpu 7200 --limit-file-size 209715200 --limit-rss-size 838860800 --append-exitstatus --redirect-output /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP/Output/InOneWeekend-hip-6.0.2.test.out --redirect-input /dev/null --summary /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP/Output/InOneWeekend-hip-6.0.2.test.time /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP/InOneWeekend-hip-6.0.2
cd /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP ; /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/tools/fpcmp-target /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP/Output/InOneWeekend-hip-6.0.2.test.out InOneWeekend.reference_output-hip-6.0.2

+ cd /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP
+ /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/tools/fpcmp-target /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP/Output/InOneWeekend-hip-6.0.2.test.out InOneWeekend.reference_output-hip-6.0.2
/buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/tools/fpcmp-target: Comparison failed, textual difference between 'M' and 'i'

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
********************
Failed Tests (1):
  test-suite :: External/HIP/InOneWeekend-hip-6.0.2.test


Testing Time: 50.74s

Total Discovered Tests: 6
  Passed: 5 (83.33%)
  Failed: 1 (16.67%)
FAILED: External/HIP/CMakeFiles/check-hip-simple-hip-6.0.2 
cd /buildbot/hip-vega20-0/clang-hip-vega20/test-suite-build/External/HIP && /buildbot/hip-vega20-0/clang-hip-vega20/llvm/bin/llvm-lit -sv empty-hip-6.0.2.test with-fopenmp-hip-6.0.2.test saxpy-hip-6.0.2.test InOneWeekend-hip-6.0.2.test TheNextWeek-hip-6.0.2.test blender.test
ninja: build stopped: subcommand failed.
program finished with exit code 1
elapsedTime=158.980199

```

https://github.com/llvm/llvm-project/pull/94321