[debug-early] fix problem with template parameter packs

[Jason Merrill]

On 05/05/2015 04:33 PM, Aldy Hernandez wrote:
> On 05/05/2015 02:08 PM, Jason Merrill wrote:
>> On 05/04/2015 09:29 PM, Aldy Hernandez wrote:
>>> The code handling parameter DIEs needed a little tweaking for variable
>>> length template arguments.  I've relaxed the original assert, but this
>>> may require tweaking at branch review time-- hopefully later this week.
>>
>> What testcase motivated this?  We're within a formal_parameter_pack, but
>
> Pretty much every other test in the libstdc++-v3 testsuite was failing
> with the ICE I elided in my patch.
>
> I wasn't able to narrow it down to a tiny test, but I can do so if you
> want. ??

I think that would be helpful so we can decide what we want the debug 
output to look like.

Jason