[libcxx] r271060 - Tolerate incorrect return type for 'isinf' and 'isnan' in tests.

[Eric Fiselier via cfe-commits]

I think that would be a possibility. However IMO such a change has little
value. Unlike other uses of `_LIBCPP_PREFERRED_OVERLOAD`, which fix const
correctness issue, I don't think the int vs bool return type distinction as
that important. Perhaps I"m just being ignorant?

/Eric
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