heap_sift
heap_sift(&ca->heap, 0, bucket_max_cmp);
heap_sift(&ca->heap, i, bucket_min_cmp);
heap_sift(iter, 0, cmp);
heap_sift(iter, i, b->ops->sort_cmp);
heap_sift(iter, i - top, bch_extent_sort_cmp);
heap_sift(iter, i - top, bch_extent_sort_cmp);
heap_sift(iter, 0, bch_extent_sort_cmp);
heap_sift(&ca->heap, 0, bucket_cmp);
heap_sift(h, 0, cmp); \
heap_sift(h, _i, cmp); \