GC_stack_last_cleared  265 gc/misc.c      word GC_stack_last_cleared = 0;	/* GC_no when we last did this */
GC_stack_last_cleared  347 gc/misc.c          if (GC_gc_no > GC_stack_last_cleared) {
GC_stack_last_cleared  349 gc/misc.c              if (GC_stack_last_cleared == 0) GC_high_water = (word) GC_stackbottom;
GC_stack_last_cleared  351 gc/misc.c              GC_stack_last_cleared = GC_gc_no;