[libcxx] r216317 - Add return statement to a test class's assignment operator. Defect found by Coverity Scan.

[Justin Bogner]

Eric Fiselier <eric at efcs.ca> writes:
> I'm not opposed to the change but using Filecheck really hurts our ability to
> test standalone.
> Also, we don't have that many compilation failures tests. I'm not sure how
> badly this change is needed.

Using clang -verify avoids that issue, but there's still the matter of
having to update almost 300 tests to use it.

Here's a quick example of hackily adding a verify flag instead of
checking for rc 1 in the lit.cfg and updating the test under discussion:

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