NetBSD/src 8L8pomCsys/net if_l2tp.c if_l2tp.h

   Divide Tx context of l2tp(4) to improve performance.

   It seems l2tp(4) call path is too long for instruction cache. So, dividing
   l2tp(4) Tx context improves CPU use efficiency.

   After this commit, l2tp(4) throughput gains 10% on my machine(Atom C3000).
VersionDeltaFile
1.37+141-72sys/net/if_l2tp.c
1.7+4-1sys/net/if_l2tp.h
+145-732 files

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