[llvm-branch-commits] [llvm] RuntimeLibcalls: Stop using defset for default calls (PR #147651)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

### Merge activity

* **Jul 13, 1:37 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/147651).


https://github.com/llvm/llvm-project/pull/147651