obsolete: drop usage of changectx in '_computecontentdivergentset'
Changectx are expensive and not needed there. The use of `repo.set` denote old
code that predate the introduction of `repo.revs` that we now use.
On my mercurial repository 495 draft:
before: 0.054239 second
after: 0.046935 second
On a mercurial repository with 115973 draft:
before: 0.564548 second
after: 0.130534 second
{
"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"
}