[llvm] [test-suite] Document the LLVM test-suite benchmark apps (PR #105843)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

> Thanks for putting this together!

Cheers. I will follow up with the SingleSource apps, but wanted to test the water for MultiSource first, and it is a bit of work.

Just as some sort of heads up, I wanted to look at the exact contents of the test-suite first before proposing some changes to it and this is basically the result of that. I will work on a little proposal to add some new ones and changes some existing apps.

https://github.com/llvm/llvm-project/pull/105843