revset: add depth limit to ancestors()
This is proposed by the
issue5374, and will be a building block of set{gen}
(set subscript) operator.
https://www.mercurial-scm.org/wiki/RevsetOperatorPlan#ideas_from_mpm
# reverse(ancestors(tip)) using hg repo
2) 0.075408
3) 0.075951
{
"version": 1,
"project": "mercurial",
"project_url": "https://mercurial-scm.org/",
"repo": "..",
"branches": ["default", "stable"],
"environment_type": "virtualenv",
"show_commit_url": "https://www.mercurial-scm.org/repo/hg/rev/",
"benchmark_dir": "benchmarks",
"env_dir": "../.asv/env",
"results_dir": "../.asv/results",
"html_dir": "../.asv/html"
}