[PR c++/81060] ICE with invalid initialzer via lambda

[Nathan Sidwell]

This patch fixes a regression my name lookup changes caused earlier this 
year.  We'd already emitted an error about a bogus template definition, 
but the fallout from that now killed us :(

I restored some of the handling r247909 removed.  Namely restoring the 
pushing of a lambda type into the scope enclosing an already-completed 
class.

Interestingly, this caused lambda-template13.C to start complaining 
about a not-defined template needing instantiating on a local (lambda) 
class.  That seems correct to me.  function's ctor is instantiated for 
the default arg in:

   void C::foo (T, function = [] {});

Applying to trunk.

nathan
-- 
Nathan Sidwell
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