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

[Stefan Krah]

Stefan Krah <stefan at bytereef.org> added the comment:

> The ways we've discussed using aligned allocation in numpy wouldn't follow this requirement without special checking. Which isn't necessarily a big deal, and numpy won't necessarily use this API anyway. But I would suggest being very clear about exactly what you guarantee and what you don't :-).

In the GitHub issue we sort of decided to make the more relaxed Posix
semantics official:

'alignment' must be a power of 2 and a multiple of 'sizeof(void *)'.

'size' can be really anything, so it should work for numpy.

It's a pity that Posix does not round up align={1,2,4} to 'sizeof(void *)'
automatically (why not?), so the applications will have to do that.

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