Implement PyOS_CheckStack on macOS using pthread_get_stack*_np

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-06-25.11:18:15.677>
labels = ['interpreter-core', 'type-feature', '3.8']
title = 'Implement PyOS_CheckStack on macOS using pthread_get_stack*_np'
updated_at = <Date 2021-03-08.23:56:35.506>
user = 'https://github.com/ronaldoussoren'

bugs.python.org fields:

activity = <Date 2021-03-08.23:56:35.506>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2018-06-25.11:18:15.677>
creator = 'ronaldoussoren'
dependencies = []
files = []
hgrepos = []
issue_num = 33955
keywords = ['patch']
message_count = 15.0
messages = ['320415', '320786', '320842', '320868', '320874', '320879', '320880', '320907', '321076', '321078', '321360', '321643', '347981', '350497', '388319']
nosy_count = 4.0
nosy_names = ['ronaldoussoren', 'vstinner', 'corona10', 'ZackerySpytz']
pr_nums = ['8046']
priority = 'low'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33955'
versions = ['Python 3.8']