C++ PATCH for c++/60375 (unevaluated lambda)

[Jason Merrill]

The parser was getting confused by trying to process the body of the 
lambda in an unevaluated context, so let's just skip the body.  The 
second patch avoids repeated errors about the issue, but isn't necessary 
to fix the ICE, so I'm saving it for after 4.9.

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