[clang] [llvm] Use global TimerGroups for both new pass manager and old pass manager timers (PR #130375)

[Alan Zhao via llvm-commits]

alanzhao1 wrote:

> Hmm...the bot breakages look like LLD test failures. Will investigate further.

Note to self: add `cross-project-tests` to `LLVM_ENABLE_PROJECTS`to repro; I had no idea that existed.

https://github.com/llvm/llvm-project/pull/130375