Use _PyTime_GetPerfCounter() in lsprof

[methane]

BPO	36575
Nosy	@vstinner, @methane
PRs	bpo-36575: lsprof: Use _PyTime_GetPerfCounter() #8378

^{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 2019-04-11.10:12:13.367>
created_at = <Date 2019-04-09.13:35:46.376>
labels = ['3.8', 'library']
title = 'Use _PyTime_GetPerfCounter() in lsprof'
updated_at = <Date 2019-04-11.10:12:13.366>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2019-04-11.10:12:13.366>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2019-04-11.10:12:13.367>
closer = 'methane'
components = ['Library (Lib)']
creation = <Date 2019-04-09.13:35:46.376>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 36575
keywords = ['patch']
message_count = 2.0
messages = ['339747', '339953']
nosy_count = 2.0
nosy_names = ['vstinner', 'methane']
pr_nums = ['8378']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36575'
versions = ['Python 3.8']

[methane]

Current lsprof uses gettimeofday on non-Windows.
_PyTime_GetPerfCounter() is better time for profiling.

[methane]

New changeset 536a35b by Inada Naoki in branch 'master':
bpo-36575: lsprof: Use _PyTime_GetPerfCounter() (GH-8378)
536a35b