[compiler-rt] [llvm] [ctxprof] Flat profile collection (PR #130655)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Mar 12, 10:47 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/130655).


https://github.com/llvm/llvm-project/pull/130655