[issue31018] _tracemalloc frame_t packing optimization not working in Windows x64

[Segev Finer]

New submission from Segev Finer:

..\Modules\_tracemalloc.c(88): warning C4359: '<unnamed-tag>': Alignment specifier is less than actual alignment (8), and will be ignored.

For this to actually work we simply need to use #pragma pack instead.

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components: Extension Modules, Windows
messages: 298999
nosy: Segev Finer, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: _tracemalloc frame_t packing optimization not working in Windows x64
type: enhancement
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31018>
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