[llvm] [llvm]Add a simple Telemetry framework (PR #102323)

[James Henderson via llvm-commits]

jh7370 wrote:

Hi @oontvoo. My apologies for the slow responses - I've got a lot of stuff on with my normal work, so don't have as much time to look at LLVM stuff currently. Also, please be warned that I'll be off on PTO for the best part of 3 weeks starting the middle of next week, so won't be able to review this further until some time after I'm back.

https://github.com/llvm/llvm-project/pull/102323