[compiler-rt] [llvm] [ctxprof] Handle instrumenting functions with `musttail` calls (PR #135121)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Apr 14, 12:59 PM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/135121).


https://github.com/llvm/llvm-project/pull/135121