Improve throughput of find_longest_match.
Improve throughput of find_longest_match.

*comment on rebase*

jordandcarter/heatshrink,senyor/heatshrink,unixdj/heatshrink-c,silentbicycle/heatshrink,senyor/heatshrink,atomicobject/heatshrink,silentbicycle/heatshrink,atomicobject/heatshrink,jordandcarter/heatshrink