[C++ PATCH] c++/78776 fix alias template ICE

[Nathan Sidwell]

On 12/12/2016 10:28 PM, Jason Merrill wrote:

> I suspect that most uses don't need to change.

Indeed. This addresses the ones I could find.  Both by grepping pt.c and 
fixing subsequent test fall out.

took the opportunity to make the control flow in get_underlying_template 
somewhat clearer.  I don't think there's anything unsurprising in this 
patch.

ok?

nathan

-- 
Nathan Sidwell
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