GET_HEAP_UNCOLLECTIBLE_BITS 1017 gc.c           #define RVALUE_UNCOLLECTIBLE_BITMAP(obj)  MARKED_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS(obj), (obj))
GET_HEAP_UNCOLLECTIBLE_BITS 1240 gc.c               CLEAR_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS(obj), obj);
GET_HEAP_UNCOLLECTIBLE_BITS 6058 gc.c               CLEAR_IN_BITMAP(GET_HEAP_UNCOLLECTIBLE_BITS(obj), obj);