Implement _PyStack_UnpackDict() with a single allocation

jdemeyer

BPO	36904
Nosy	@scoder, @vstinner, @encukou, @methane, @markshannon, @jdemeyer
PRs	bpo-36904: new function _PyStack_DictAsVector #13308 bpo-36904: Optimize _PyStack_UnpackDict #14517

^{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 2019-07-02.13:04:55.023>
created_at = <Date 2019-05-13.15:22:54.320>
labels = ['interpreter-core', '3.8', 'performance']
title = 'Implement _PyStack_UnpackDict() with a single allocation'
updated_at = <Date 2019-07-02.13:04:55.022>
user = 'https://github.com/jdemeyer'

bugs.python.org fields:

activity = <Date 2019-07-02.13:04:55.022>
actor = 'jdemeyer'
assignee = 'none'
closed = True
closed_date = <Date 2019-07-02.13:04:55.023>
closer = 'jdemeyer'
components = ['Interpreter Core']
creation = <Date 2019-05-13.15:22:54.320>
creator = 'jdemeyer'
dependencies = []
files = []
hgrepos = []
issue_num = 36904
keywords = ['patch']
message_count = 3.0
messages = ['342339', '342379', '347124']
nosy_count = 6.0
nosy_names = ['scoder', 'vstinner', 'petr.viktorin', 'methane', 'Mark.Shannon', 'jdemeyer']
pr_nums = ['13308', '14517']
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue36904'
versions = ['Python 3.8']