[patch] Fix PR16060

[Rafael Espíndola]

Hi Richard,

Attached is a new version with the suggestions you had on irc.

On 29 May 2013 22:19, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> The testcase in PR16060 points out that while template arguments can
> show that a type is not externally visible, the standards still says
> they have external linkage.
>
> In terms of our implementation, it means that we should merge just the
> isExternallyVisible bit, not the formal linkage.
>
> This patch does just that. Suggestion for a less confusing name than
> LinkageVisibility are welcome!
>
> Cheers,
> Rafael
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