revset: use `subset &` in `divergent`
This takes advantage of the `fullreposet` smartness.
revset #0: divergent()
0) wall 0.002047 comb 0.000000 user 0.000000 sys 0.000000 (best of 813)
1) wall 0.000052 comb 0.000000 user 0.000000 sys 0.000000 (best of 22757)
revset: use `subset &` in `bisect`
This takes advantage of the `fullreposet` smartness.
revset #0: bisect(range)
0) wall 0.014007 comb 0.010000 user 0.010000 sys 0.000000 (best of 115)
1) wall 0.005556 comb 0.010000 user 0.010000 sys 0.000000 (best of 235)