[patch] Use aliases for more constructors and destructors

[Rafael Espíndola]

Sorry, correct patch now attached.

On 4 October 2013 23:40, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> I noticed that gcc uses aliases in, for example:
>
> template<typename T>
> struct foobar {
>   foobar() {
>   }
> };
> template struct foobar<void>;
>
> clang is currently way too conservative. It only uses aliases when the
> symbols are strong. It is safe to use aliases to weak symbols, as long
> and the alias itself is also weak.
>
> The attached patch implements that.
>
> Cheers,
> Rafael
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