[Bug c++/66745] [6 Regression] ice in check_unstripped_args

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66745

--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Ramana Radhakrishnan from comment #5)
> I've had a look at it - however it's not an area that I've worked in before,
> so beware it will take me a while to understand the issue here.
> 
> If someone can help with a reduced testcase that would be appreciated.

I've tried to reduce the testcase, but have given up. 
(After 12h it was reduced by only 10%.)
This is a ~10MB boost testcase, so it might takes days to reduce it.