* Enable PGO for Windows builds.
* instrumented prefix wasn't actually being added.
* Port generate_pgo_profiles.sh to PowerShell (thanks Claude).
* Try disabling RX so we can at least debug rest of pipeline.
* Fix profraw path.
* Try enabling RX code again.
* See if we can get some extra debugging.
* Bound process wait.
* Use Reporting sox invocation.
* Redo config file prior to RX run.
* Fix LLVM profile merge error.
* Add PR #1457 to changelog.