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

[Richard Smith]

+Use ``__has_feature(cxx_alignof)`` or ``__has_extension(cxx_alignof)`` to
+determine if support for alignment specifiers using ``alignof`` is enabled.

`alignof` is not an alignment-specifier. Maybe "... to determine if support
for the ``alignof`` keyword is enabled."?

Likewise for _Alignof.

Otherwise, this seems fine to me.

On Tue, Dec 2, 2014 at 4:40 PM, Nico Weber <thakis at chromium.org> wrote:

> 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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