[llvm] RuntimeLibcalls: Remove __muloti4 from default libcall set (PR #148562)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Jul 14, 3:51 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/148562).


https://github.com/llvm/llvm-project/pull/148562