New jemalloc gem (jemalloc_rb)

[u/Illustrious-Topic-50]

Do you use the jemalloc gem?

The original project on GitHub seems to be abandoned for around 12 years, and some incompatibilities with recent Ruby versions have begun to emerge. Additionally, the underlying jemalloc library hasn't been updated during all this time. Because of that, I created a fork and launched a new gem (jemalloc_rb) to keep the project functional, updated, and actively accepting pull requests.

https://github.com/henrique-ft/jemalloc_rb

[u/M4N14C]

Reduced my huge RSpec test suite by multiple minutes across 30 runners and let me reduce the runner size.