C++ PATCH for c++/54277 (wrong cv-quals in lambda)

[Jason Merrill]

I have no idea why the existing code tried to deduce the desired quals 
from current_class_ref rather than just look at the object it has.  That 
gives the wrong answer if current_class_ref is for a lambda.

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