Since trie configuration remains invariant during each DXR instance
lifetime, instead of shifting and masking lookup keys by values
computed at runtime, compile upfront several dxr_lookup()
configurations with hardcoded shift / mask constants, and choose the
apropriate lookup function version after each DXR instance rebuild.

In synthetic tests this yields small but measurable (5-10%) lookup
throughput improvement, depending on FIB size and  prefix patterns.

MFC after:	3 days