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

[Eric Snow]

Eric Snow added the comment:

FYI, the C OrderedDict implementation in #16991 implements its own doubly-linked list, built around the needs of OrderedDict.  I looked into BSD's queue.h [1], but it ended up simpler to roll my own.

[1] http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/queue.h?rev=1.56

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nosy: +eric.snow

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