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

[STINNER Victor]

STINNER Victor added the comment:

Note: I just checked PYTHONMALLOCSTATS=1 with -X tracemalloc. It looks like it works as expected. Tracemalloc hooks are unregistered before stats are displayed at exit, _Pymem_PymallocEnabled() returns 1 as expected.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26516>
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