Refactor docstring handling code in the compiler

[serhiy-storchaka]

BPO	33691
Nosy	@brettcannon, @ncoghlan, @benjaminp, @methane, @serhiy-storchaka, @1st1
PRs	bpo-33691: Add _PyAST_GetDocString(). #7236

^{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 2018-05-30.07:57:00.961>
created_at = <Date 2018-05-30.05:34:34.593>
labels = ['interpreter-core', 'type-feature', '3.8']
title = 'Refactor docstring handling code in the compiler'
updated_at = <Date 2018-05-30.07:57:00.961>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-05-30.07:57:00.961>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-30.07:57:00.961>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2018-05-30.05:34:34.593>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 33691
keywords = ['patch']
message_count = 2.0
messages = ['318155', '318159']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'ncoghlan', 'benjamin.peterson', 'methane', 'serhiy.storchaka', 'yselivanov']
pr_nums = ['7236']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33691'
versions = ['Python 3.8']

[serhiy-storchaka]

Similar non-trivial code is used in several places in the compiler for handling docstrings. The proposed PR adds a helper _PyAST_GetDocString() for reusing a code.

[serhiy-storchaka]

New changeset 143ce5c by Serhiy Storchaka in branch 'master':
bpo-33691: Add _PyAST_GetDocString(). (GH-7236)
143ce5c