[llvm] [llvm-exegesis] Add thread IDs to subprocess memory names (PR #84451)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

This is aimed at enabling the use of multi threads within Gematria, where we want to do memory annotations and benchmarking in parallel to process a large number of snippets (on the order of hundreds of millions now) at a decent rate. There are some other things that additionally need to be added that I have planned for follow-up patches, including core pinning. This patch isn't particularly useful to upstream exegesis, but others, like core pinning, definitely would be.

https://github.com/llvm/llvm-project/pull/84451