revset: added lazyset implementation to keyword revset...
revset: added lazyset implementation to keyword revset
Performance benchmarking:
$ time hg log -qr "first(keyword(changeset))"
0:9117c6561b0b
real 0m3.466s
user 0m3.345s
sys 0m0.072s
$ time ./hg log -qr "first(keyword(changeset))"
0:9117c6561b0b
real 0m0.365s
user 0m0.199s
sys 0m0.083s