[llvm] [ctxprof] dump profiles using yaml (for testing) (PR #123108)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Jan 15, 7:47 PM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/123108).


https://github.com/llvm/llvm-project/pull/123108