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

[STINNER Victor]

STINNER Victor added the comment:

3de17d13002d.patch:
- take in account Antoine Pitrou's and vajrasky's comments
- pack again frame_t structure (without the assertion and with a comment)

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Added file: http://bugs.python.org/file32753/3de17d13002d.patch

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