[llvm] ARM: Start moving runtime libcalls into tablegen (PR #146084)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Jul 10, 10:36 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/146084).


https://github.com/llvm/llvm-project/pull/146084