tra added a comment.

I've never seen it triggered. Fix is based on the comment above the function 
that D==nullptr is acceptable and the fact that we are checking D in other 
places in this function.

Two cases where nullptr D is passed explicitly has something to do with 
-fblocks, but that does not seem to be used neither with CUDA nor with 
'IsForDefinition' which was brought in to deal with a strange case of 
redefining C++ symbols in C. This is probably why it's not triggered.


http://reviews.llvm.org/D20141



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