Splitting Each HuffmanIncomingTable into two parts avoids the wasted
0/nullptr fields and allows the remaining fields to be packed more efficiently.
Making them all const allows them to be shared between processes.
On 64-bit platforms this saves (60*N - 7.5) KiB, where N is the number of
processes.
--HG--
extra : rebase_source : 1c55b325a01df53b0d8e28e5f3102b8ed57e5e47
Sylvestre Ledru
David Major
Nicholas Nethercote
Nicholas Hurley
Patrick McManus