[PATCH] Fix crash in cleanup attr handling

[Aaron Ballman]

Patch LGTM!

~Aaron

On Sun, Oct 20, 2013 at 2:19 AM, Alp Toker <alp at nuanti.com> wrote:
> Reduction:
>
> void c3(int *a) {
>   void c3() {}
>   void t3() {
>     int v1 __attribute__((cleanup(c3)));
> }
>
> ResolveSingleFunctionTemplateSpecialization() returns 0 and doesn't emit
> diags unless the expression has template-ids, so we must null check the
> result.
>
> Also add a better diag noting which overloads are causing the problem.
>
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