C++ PATCH for c++/84036, ICE with variadic lambda capture

[Jason Merrill]

On Sun, Feb 11, 2018 at 8:21 PM, Jason Merrill <jason@redhat.com> wrote:
> The old lambda model handled variadic capture by focusing on the
> FIELD_DECL rather than trying to map between capture proxies.  The new
> model relies more on capture proxies, so it makes sense to use them
> more for variadic capture as well.  So with this patch we treat a
> variadic capture proxy as a pack, rather than the field.

Which makes the recently added is_capture_proxy_with_ref redundant.

Tested x86_64-pc-linux-gnu, applying to trunk.
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