[issue18874] Add a new tracemalloc module to trace memory allocations

[STINNER Victor]

STINNER Victor added the comment:

The issue #16742 must be fixed to be able to trace memory blocks allocated by PyMem_RawMalloc().

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dependencies: +PyOS_Readline drops GIL and calls PyOS_StdioReadline, which isn't thread safe

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18874>
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