feat(tazjin/rlox): Add a simple string interner r/2259

This is based on this matklad post:

https://matklad.github.io/2020/03/22/fast-simple-rust-interner.html

It's modified slightly to provide a safer interface and slightly more
readable implementation:

* interned string IDs are wrapped in a newtype that is not publicly
  constructible

* unsafe block is reduced to only the small scope in which it is
  needed

* lookup lifetime is pinned explicitly to make the intent clearer when
  reading this code

Change-Id: Ia3dae988f33f8e5e7d8dc0c1a9216914a945b036
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2578
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

0 files changed, 0 insertions, 0 deletions