[llvm] [PowerPC] fixed issue "Failure to optimize (x == 0) ? 0xFF : 0 to addic+subfe instead of cntlzw+srwi+neg" (PR #190606)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `libc-aarch64-ubuntu-fullbuild-dbg` running on `libc-aarch64-ubuntu` while building `llvm` at step 2 "update-annotated-scripts".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/71/builds/46564

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

```
Step 2 (update-annotated-scripts) failure: update (failure)
git version 2.30.2
remote: Internal Server Error
fatal: unable to access 'https://github.com/llvm/llvm-zorg.git/': The requested URL returned error: 500
remote: Internal Server Error
fatal: unable to access 'https://github.com/llvm/llvm-zorg.git/': The requested URL returned error: 500

```

</details>

https://github.com/llvm/llvm-project/pull/190606