[c++-concepts] Fix assertion failure with cp_maybe_constrained_type_specifier

[Andrew Sutton]

Committed as r211935. I updated the patch to add a more appropriate
comment and changelog entry.

Andrew

On Tue, Jun 24, 2014 at 8:07 AM, Ed Smith-Rowland <3dw4rd@verizon.net> wrote:
> I saw this during bootstrap.  I've verified that the patch works (I was
> working on similar).
>
> Ed
>
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