Use _PY_FASTCALL_SMALL_STACK for method_vectorcall

[jdemeyer]

BPO	37233
Nosy	@methane, @jdemeyer, @miss-islington
PRs	bpo-37233: use _PY_FASTCALL_SMALL_STACK in method_vectorcall #13974 bpo-37233: optimize case totalargs == 0 in method_vectorcall #14550 [3.8] bpo-37233: use _PY_FASTCALL_SMALL_STACK in method_vectorcall (GH-13974) #14573 [3.8] bpo-37233: optimize method_vectorcall in case of totalargs == 0 (GH-14550) #14574

^{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 2019-06-18.13:41:51.025>
created_at = <Date 2019-06-11.14:43:31.679>
labels = ['interpreter-core', '3.9', 'performance']
title = 'Use _PY_FASTCALL_SMALL_STACK for method_vectorcall'
updated_at = <Date 2019-07-03.13:06:41.181>
user = 'https://github.com/jdemeyer'

bugs.python.org fields:

activity = <Date 2019-07-03.13:06:41.181>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2019-06-18.13:41:51.025>
closer = 'jdemeyer'
components = ['Interpreter Core']
creation = <Date 2019-06-11.14:43:31.679>
creator = 'jdemeyer'
dependencies = []
files = []
hgrepos = []
issue_num = 37233
keywords = ['patch']
message_count = 5.0
messages = ['345234', '345968', '347218', '347227', '347229']
nosy_count = 3.0
nosy_names = ['methane', 'jdemeyer', 'miss-islington']
pr_nums = ['13974', '14550', '14573', '14574']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue37233'
versions = ['Python 3.9']

[jdemeyer]

The PEP-590 implementation for type "method" caused a minor regression: instead of using _PyObject_Call_Prepend(), method_vectorcall manually allocates and fills a newly allocated vector. This does NOT use the _PY_FASTCALL_SMALL_STACK optimization, but it should.

[methane]

New changeset 988e6aa by Inada Naoki (Jeroen Demeyer) in branch 'master':
bpo-37233: use _PY_FASTCALL_SMALL_STACK in method_vectorcall (GH-13974)
988e6aa

[methane]

New changeset 53c2143 by Inada Naoki (Jeroen Demeyer) in branch 'master':
bpo-37233: optimize method_vectorcall in case of totalargs == 0 (GH-14550)
53c2143

[methane]

New changeset c7570d4 by Inada Naoki in branch '3.8':
[3.8] bpo-37233: use _PY_FASTCALL_SMALL_STACK in method_vectorcall (GH-13974)
c7570d4

[miss-islington]

New changeset 1099e34 by Miss Islington (bot) in branch '3.8':
bpo-37233: optimize method_vectorcall in case of totalargs == 0 (GH-14550)
1099e34