INCR_FREE_BYTES   289 gc/allchblk.c      INCR_FREE_BYTES(index, - (signed_word)(hhdr -> hb_sz));
INCR_FREE_BYTES   350 gc/allchblk.c      INCR_FREE_BYTES(index, hhdr -> hb_sz);
INCR_FREE_BYTES   525 gc/allchblk.c        INCR_FREE_BYTES(index, -(signed_word)h_size);