[stacktraces] Keep addr2line procs around (#99670)
This PR caches the addr -> Frame information across calls to symbolize,
and also keeps the addr2line symbolizing processes around once requested.
This makes calls to symbolize frames that have been seen before nearly instant,
and makes lookup of address in libraries that have already been loaded by
addr2line faster.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99670
Approved by: https://github.com/ezyang
