C++ PATCH for c++/67941 (UBsan error with empty lambda)

Jason Merrill jason@redhat.com
Wed Nov 25 18:59:00 GMT 2015

The _FUN function returned by the lambda conversion operator calls the 
op() with a null object argument, which would be undefined behavior for 
user code, but we can get away with it internally since it isn't 
observable.  Tell UBsan to ignore it.

Tested x86_64-pc-linux-gnu, applying to trunk and 5.
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