[compiler-rt] [ctxprof][nfc] Move 2 implementation functions up in `CtxInstrProfiling.cpp` (PR #133146)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Mar 28, 11:52 PM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/133146).


https://github.com/llvm/llvm-project/pull/133146