Streamline find_method implementation
Streamline find_method implementation

This is called more now, since it's what is used to set up the inline
caches at callsites. Thus it's worth shaving some cycles off. These
tweaks are worth almost half a million CPU cycles off startup alone.

MasterDuke17/rakudo,rakudo/rakudo,tbrowder/rakudo,labster/rakudo,labster/rakudo,rakudo/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,salortiz/rakudo,salortiz/rakudo,tbrowder/rakudo,labster/rakudo,rakudo/rakudo,tbrowder/rakudo,labster/rakudo,rakudo/rakudo,tbrowder/rakudo,salortiz/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,salortiz/rakudo,salortiz/rakudo,rakudo/rakudo,tbrowder/rakudo,rakudo/rakudo,labster/rakudo,salortiz/rakudo,labster/rakudo