[PATCH] Fix crash in cleanup attr handling

[Alp Toker]

The reduction got chewed up in my previous mail. Should be:

  void c3(int *a) {}
  void c3() {}
  void t3() {
    int v1 __attribute__((cleanup(c3)));
  }

On 20/10/2013 07:19, Alp Toker 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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