linuxjit doesn't support compiled filters batch

linuxjit makes a local copy of the current compiled filter. This design
enables a layered approach in order to ease debugging.

bench.lua supports pre-compiling a batch of filters and then iterating
over them.

Ths patch handles compiling/running lunuxjit filters while keeping pred
interface. It doesn't impact performance measures and benchmarking.
Stop garbage collection in bench.lua