[clang] [llvm] Reapply "Use global TimerGroups for both new pass manager and old pass manager timers" (#131173) (PR #131217)

[Arthur Eubanks via llvm-commits]

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

not locking causing the test failures makes sense

https://github.com/llvm/llvm-project/pull/131217