greatly simplify garbage collection algorithm, trust underlying malloc implementation more.
greatly simplify garbage collection algorithm, trust underlying malloc implementation more.

Ignore-this: 6fcbd7449f187ab148d9c3c08232b2cd

darcs-hash:20100327185011-1a7c6-4888a7679d56c0d311926c323ca50b0f1b7bb476

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc