Choose the Garbage Collector used by the translated program:
- "ref": reference counting. Takes very long to translate and the result is slow.
- "framework": our custom mark-and-sweep collector. Takes moderately long and is the fastest option without external dependencies.
- "stacklessgc": same as "framework" but uses a different method to find the garbage collection roots on the stack, by unwinding it, using stackless: --stackless.
- "boehm": use the Boehm conservative GC