The debug log is only revealed when something goes wrong, but it is
created and discarded every time `seek_backward` is called, and it
is quite CPU-intensive.
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This template turns a forward search primitive (e.g. lower_bound, FIEMAP,
TREE_SEARCH_V2) into a backward search primitive.
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
