[C++ Patch] Another permerror related tweak

[Jason Merrill]

OK.  And I think this qualifies as obvious; you don't need to wait for
approval on further patches like this.

Jason

On Tue, Jul 17, 2018 at 10:17 PM, Paolo Carlini
<paolo.carlini@oracle.com> wrote:
> Hi again,
>
> here I noticed a pair of consecutive permerrors (instead of permerror +
> inform) and also that the first one isn't exploiting DECL_SOURCE_LOCATION
> (which makes a real difference at least in a couple of cases which I'm
> explicitly testing below). Tested x86_64-linux.
>
> Thanks, Paolo.
>
> /////////////////
>