bcachefs: Optimize __bch2_btree_node_iter_advance()

This replaces an expensive memmove() call with an open-coded version.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2022-10-21 17:37:42 -04:00
commit 005def8ff1