[cfe-dev] warn_unused_result attribute on class definition not applying to methods declared in that class

[Craig Topper via cfe-dev]

It seems if warn_unused_result is put on a class definition it doesn't
apply to any of the methods in that class that return the class type?

This test should generate 2 warnings but only generates one.

https://godbolt.org/g/kImv9k

The ArrayRef and APInt classes both do this. I accidentally created a case
where I didn't consume the result of APInt::trunc and received no warning.

~Craig
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