[PATCH] Fix crash in cleanup attr handling

[Alp Toker]

Thanks, landed in r193055 with an additional comment documenting
ResolveSingleFunctionTemplateSpecialization() behaviour.

Alp.

On 20/10/2013 15:42, Aaron Ballman wrote:
> 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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