[issue26516] Add PYTHONMALLOC env var and add support for malloc debug hooks in release mode

[Roundup Robot]

Roundup Robot added the comment:

New changeset aa280432e9c7 by Victor Stinner in branch 'default':
Add PYTHONMALLOC env var
https://hg.python.org/cpython/rev/aa280432e9c7

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<http://bugs.python.org/issue26516>
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