[issue31911] Use malloc_usable_size() in pymalloc for realloc

[STINNER Victor]

Change by STINNER Victor <victor.stinner at gmail.com>:


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title: Use malloc_usable_size() is pymalloc for realloc -> Use malloc_usable_size() in pymalloc for realloc

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31911>
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