Possible refcount issues in the compiler

BPO	33132
Nosy	@serhiy-storchaka, @miss-islington
PRs	bpo-33132: Fix reference counting issues in the compiler. #6209 [3.7] bpo-33132: Fix reference counting issues in the compiler. (GH-6209) #6217 [3.6] bpo-33132: Fix reference counting issues in the compiler. (GH-6209). #6321 [2.7] bpo-33132: Fix reference counting issues in the compiler. (GH-6209). #6322 bpo-33132: Fix more reference counting issues in the compiler. #6323 [3.7] bpo-33132: Fix more reference counting issues in the compiler. (GH-6323) #6327

^{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 = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2018-04-01.07:42:56.470>
created_at = <Date 2018-03-24.12:32:25.137>
labels = ['interpreter-core', '3.7', '3.8', 'performance']
title = 'Possible refcount issues in the compiler'
updated_at = <Date 2018-04-01.07:42:56.308>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-04-01.07:42:56.308>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2018-04-01.07:42:56.470>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2018-03-24.12:32:25.137>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 33132
keywords = ['patch']
message_count = 7.0
messages = ['314365', '314384', '314386', '314747', '314748', '314750', '314766']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'miss-islington']
pr_nums = ['6209', '6217', '6321', '6322', '6323', '6327']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue33132'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']