[issue31626] Writing in freed memory in _PyMem_DebugRawRealloc() after shrinking a memory block

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

> * 3.6: don't memset() --> correct, but don't detect "use after free" bug
> when a memory block is skrinked

And doesn't detect  "use after free" bug when a memory block is expanded. And 
2.7 doesn't detect this. Only 3.7 detects this.

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<https://bugs.python.org/issue31626>
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