contrib/benchmarks/perf.py

dirstate: remove need_delay logic

Now that all¹ stored mtime are non ambiguous, we no longer need to apply the `need_delay` step.
The need delay logic was not great are mtime gathered during longer operation
could be ambiguous but younger than the `dirstate.write` call time.

So, we don't need that logic anymore and can drop it

This make the code much simpler. The code related to the test extension faking
the dirstate write is now obsolete and associated test will be migrated as
follow up. They currently do not break.

[1] except the ones from `hg update`, but `need_delay` no longer help for them
either.

Differential Revision: https://phab.mercurial-scm.org/D11796

# perf.py - asv benchmarks using contrib/perf.py extension
#
# Copyright 2016 Logilab SA <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from . import perfbench


@perfbench()
def track_tags(perf):
    return perf("perftags")


@perfbench()
def track_status(perf):
    return perf("perfstatus", unknown=False)


@perfbench(params=[('rev', ['1000', '10000', 'tip'])])
def track_manifest(perf, rev):
    return perf("perfmanifest", rev)


@perfbench()
def track_heads(perf):
    return perf("perfheads")