[llvm] [ARM] TableGen-erate node descriptions (PR #168212)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-x86_64-linux-android` running on `sanitizer-buildbot-android` while building `llvm` at step 1 "update-annotate-scripts".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/186/builds/14070

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

```
Step 1 (update-annotate-scripts) failure: update (failure)

```

</details>

https://github.com/llvm/llvm-project/pull/168212