[patch] add support for has_feature(cxx_alignof) and has_feature(c_alignof)

[Nico Weber]

ping!

On Mon, Dec 1, 2014 at 1:07 PM, Nico Weber <thakis at chromium.org> wrote:

> r142020 added support for has_feature(cxx_alignas). This patch does the
> same for alignof.
>
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