tokenizer.c memory leak in case of realloc failure

BPO	36367
Nosy	@vstinner, @stratakis, @pablogsal
PRs	bpo-36367: Free buffer if realloc fails in tokenize.c #12442 [2.7] bpo-36367: Free buffer if realloc fails in tokenize.c (GH-12442) #12470 [3.7] bpo-36367: Free buffer if realloc fails in tokenize.c (GH-12442) #12471

^{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 2019-03-19.17:18:20.933>
created_at = <Date 2019-03-19.16:12:41.176>
labels = ['3.7', '3.8']
title = 'tokenizer.c memory leak in case of realloc failure'
updated_at = <Date 2019-03-20.12:03:56.804>
user = 'https://github.com/stratakis'

bugs.python.org fields:

activity = <Date 2019-03-20.12:03:56.804>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-19.17:18:20.933>
closer = 'pablogsal'
components = []
creation = <Date 2019-03-19.16:12:41.176>
creator = 'cstratak'
dependencies = []
files = []
hgrepos = []
issue_num = 36367
keywords = ['patch']
message_count = 4.0
messages = ['338375', '338391', '338459', '338460']
nosy_count = 3.0
nosy_names = ['vstinner', 'cstratak', 'pablogsal']
pr_nums = ['12442', '12470', '12471']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36367'
versions = ['Python 2.7', 'Python 3.7', 'Python 3.8']