patch: check constructor initializer list packs

[Richard Smith]

Is there a reason not to just build a single vector of unexpanded
packs, and check it once?

On Wed, Jun 12, 2013 at 4:20 PM, Nick Lewycky <nlewycky at google.com> wrote:
> This patch fixes a slight oversight with a pack expansion of constructor
> initialization lists of the form "S() : T<Pack1>(Pack2)... {}" not checking
> the arity of the unexpanded packs in the initializer expression.
>
> Fixes PR16303. Please review!
>
> Nick
>
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