[issue25300] Enable Intel MPX (Memory protection Extensions) feature

[STINNER Victor]

STINNER Victor added the comment:

FYI In the discussion of the PEP 445 "Add new APIs to customize Python
memory allocators" it was proposed to add runtime option to choose the
memory allocator. At least for debug purpose, it would help to be able
to use malloc() for *all* Python memory allocations. Would it help to
find more bugs with MPX?

It's not possible to disable our fast allocator for small objects,
disabling it has a high cost on performances (Python would be much
slower).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25300>
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