C++ PATCH for c++/58083 (ICE with lambda in default argument)

[Jason Merrill]

The standard says that lambdas go in the enclosing block, class or 
namespace scope, but also that default arguments aren't parsed until the 
class is complete.  So we need to accept pushing a lambda into a 
complete class.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.8.
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