[llvm] [nfc][ctx_prof] Don't try finding callsite annotation for un-instrumentable callsites (PR #109184)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Sep 19, 12:13 AM EDT**: @mtrofin merged this pull request with [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/109184).


https://github.com/llvm/llvm-project/pull/109184