RFA (libstdc++): PATCH to implement C++17 over-aligned new

[Rainer Orth]

Hi Jason,

> OK, one more:

this works just fine on both sparc-sun-solaris2.12 and
i386-pc-solaris2.12.

Once Jonathan's patch to heed aligned_alloc's requirement on size being
a multiple of alignment is in, all is fine on Solaris.

Thanks.
	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University