[issue26249] Change PyMem_Malloc to use pymalloc allocator

[STINNER Victor]

STINNER Victor added the comment:

> 68b2a43d8653 introduced memory leak.

I was very surprised to see a regression in test_format since I didn't change any change related to bytes, bytearray or str formatting in this issue.

In fact, it's much better than that! With PyMem_Malloc() using pymalloc, we benefit for free of the cheap "_Py_AllocatedBlocks" memory leak detector. I introduced the memory leak in the issue #25349 when I optimimzed bytes%args and bytearray%args using the new _PyBytesWriter API.

This memory leak gave me an idea, I opened the issue #26850: "PyMem_RawMalloc(): update also sys.getallocatedblocks() in debug mode".

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<http://bugs.python.org/issue26249>
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