[issue18835] Add aligned memory variants to the suite of PyMem functions/macros

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

Stefan Krah: "we care about the C11 restriction? (...) "size - number of bytes to allocate. An integral multiple of alignment" (...) posix_memalign and _aligned_malloc don't care about the multiple."

I prefer to ignore this restriction at this point.

I wouldn't be surprised if posix_memalign() and _aligned_malloc() already align the size for us internally.

We can add the restriction later, if needed.

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<https://bugs.python.org/issue18835>
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