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

[James Henderson via llvm-commits]

jh7370 wrote:

> @jh7370 Hi, I think I have made all of your requested changes now; this should be ready for final review/approval. Please have a look when you can! Thanks!

Hi @oontvoo, sorry for the delay in looking at this - I've got some high priority stuff that I need to do for my regular workload, which means I cannot spend significant time on LLVM reviews at the moment. I should be finished with it by the end of the week, so if I don't get to this review before the end of the week, I'll be looking at it early next week.

Aside: I noticed that the documentation build has failed due to a warning from this PR.

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