K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-12-09T05:27:45.514028Z
K 7
svn:log
V 328
grep: replace the internal queue with a ring buffer

We know up front how many items we can have in the queue (-B/Bflag), so
pay the cost of those particular allocations early on.

The reduced queue maintenance overhead seemed to yield about an ~8%
improvement for my earlier `grep -C8 -r closefrom .` test.

MFC after:	2 weeks

END