[OPTIM] ebtree: inline ebst_lookup_len and ebis_lookup_len

(from ebtree 6.0.5)

Both of them are very short and rely on another non-inlined lookup function,
so it's pointless to have them as pure functions, it wastes space.
(cherry picked from commit 1e68d6fef815f759304d4cc0e65f957689e19a7a)
4 files changed