Performance regression for making bound methods

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-12-21.20:13:01.396>
labels = ['interpreter-core', '3.9', 'performance']
title = 'Performance regression for making bound methods'
updated_at = <Date 2020-04-28.21:51:46.108>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2020-04-28.21:51:46.108>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2019-12-21.20:13:01.396>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 39117
keywords = []
message_count = 7.0
messages = ['358781', '358802', '358807', '367556', '367566', '367567', '367568']
nosy_count = 6.0
nosy_names = ['rhettinger', 'vstinner', 'benjamin.peterson', 'methane', 'serhiy.storchaka', 'pablogsal']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue39117'
versions = ['Python 3.9']