Change PyMem_Malloc to use pymalloc allocator

[vstinner]

BPO	26249
Nosy	@rhettinger, @pitrou, @vstinner, @serhiy-storchaka, @catalin-manciu
Files	pymem.patch python_memleak.py tu_malloc.c pymem_27.patch pymalloc.patch

^{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: ```python assignee = None closed_at = created_at = labels = ['performance'] title = 'Change PyMem_Malloc to use pymalloc allocator' updated_at = user = 'https://github.com/vstinner' ``` bugs.python.org fields: ```python activity = actor = 'vstinner' assignee = 'none' closed = True closed_date = closer = 'vstinner' components = [] creation = creator = 'vstinner' dependencies = [] files = ['41767', '41778', '41779', '42004', '42158'] hgrepos = [] issue_num = 26249 keywords = ['patch'] message_count = 51.0 messages = ['259290', '259297', '259376', '259377', '259378', '259379', '259382', '259383', '259384', '259385', '259389', '259390', '259391', '259392', '259393', '259395', '259440', '259441', '259445', '260674', '260675', '260681', '261430', '261431', '261433', '261445', '261446', '261447', '261448', '261449', '261450', '261452', '261453', '261454', '261455', '261456', '261457', '261458', '261459', '261488', '261749', '261766', '261788', '264020', '264027', '264130', '264132', '264174', '264245', '264251', '264252'] nosy_count = 8.0 nosy_names = ['rhettinger', 'pitrou', 'vstinner', 'python-dev', 'jtaylor', 'serhiy.storchaka', 'alecsandru.patrascu', 'catalin.manciu'] pr_nums = [] priority = 'normal' resolution = 'fixed' stage = None status = 'closed' superseder = None type = 'performance' url = 'https://bugs.python.org/issue26249' versions = ['Python 3.6'] ```

[vstinner]

There are no more know bugs related to this change, I close the issue. Thanks for the test_format report Serhiy, I missed it.