[llvm] Make llvm::telemetry::Manager::preDispatch protected. (PR #127114)

[Pavel Labath via llvm-commits]

https://github.com/labath approved this pull request.

(@jh7370 FYI)

LGTM.

This is less definitely less important, but I'm also wondering if there's a reason for `dispatch` to be virtual (given that `preDispatch` is sort of the official customization point for messing with entries).

https://github.com/llvm/llvm-project/pull/127114