[issue40781] Remove sys._debugmallocstats() function and PYTHONMALLOCSTATS environment variable

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I use it often when I investigate memory usage.
It provides some useful information even in release Python build. For example:

* Which size class is most allocated?
* How many block are allocated?
* Which size class have most free blocks? (e.g. Inner fragmentation)
* Combined with tracing application to stderr, which part of the application increase memory usage?

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<https://bugs.python.org/issue40781>
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