[issue43313] feature: support pymalloc for subinterpreters. each subinterpreter has pymalloc_state

[junyixie]

junyixie <xie.junyi at outlook.com> added the comment:

> malloc pointer in interpreterA and free pointer is usual.

malloc pointer in interpreterA and free pointer in interpreterB is usual.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43313>
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