obsolete: speed up unstable computation Speed up the computation of the unstable revset by using the not public() revset. In another series of patches, we optimize the not public() revset and together it leads to a 50-100x speedup on the computation of unstable() for our big repos.

obsolete: speed up computation of bumped revset Speed up the computation of the bumped revset by using the not public() revset. In another patch series, we optimized the not public() revset. Together, this cuts the cost of the computation of bumped() from 17% of the total time of smartlog on our big repo to under 0.1% of the total time.