Use fastpath in asyncio.sleep if delay<0

[asvetlov]

BPO	32351
Nosy	@asvetlov, @1st1
PRs	#4908

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-12-17.14:42:09.626>
created_at = <Date 2017-12-17.12:22:02.663>
labels = ['3.7', 'expert-asyncio', 'library', 'performance']
title = 'Use fastpath in asyncio.sleep if delay<0'
updated_at = <Date 2017-12-17.14:42:09.625>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2017-12-17.14:42:09.625>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-17.14:42:09.626>
closer = 'asvetlov'
components = ['Library (Lib)', 'asyncio']
creation = <Date 2017-12-17.12:22:02.663>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 32351
keywords = ['patch']
message_count = 2.0
messages = ['308487', '308489']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['4908']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue32351'
versions = ['Python 3.7']

[asvetlov]

Currently asyncio.sleep schedules a callback execution by loop.call_later() call, which has the same behavior but 2x slower.

[asvetlov]

New changeset 5382c05 by Andrew Svetlov in branch 'master':
bpo-32351: Use fastpath in asyncio.sleep if delay<0 (bpo-4908)
5382c05