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

[James Henderson via llvm-commits]

jh7370 wrote:

> @jh7370 We would love to land this before the break. Is it possible to do that soon? Any additional tweaks and adjustments can be made later, as needed. Thanks!

I'm not going to have time to look at this today (I've got a half day), but will prioritise this as much as I can next week. I'm working until the 23rd, so hopefully that's enough time.

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