Their allocation pathways are already tuned for their respective platforms.
This is a copy of the libc malloc-based allocator that we previously had. It's preferable to use the Orca runtime allocator over our own.
- Add the test bench for the allocator - Move old allocator code to the test bench - Fix `heap_resize` usage in `os2/env_linux.odin` to fit new API requiring `old_size`
