1c0be3864a8745e3d77c2eeda719f2e0a48818ed

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@165884 91177308-0d34-0410-b5e6-96231b3b80d8
Use traits_type::to_int_type in basic_streambuf<_CharT, _Traits>::xsputn when calling overflow to correctly handle negative signed character types. This fixes http://llvm.org/bugs/show_bug.cgi?id=14074.
Add overflow check to tanh(complex) and reduce to finite answer. Fixes http://llvm.org/bugs/show_bug.cgi?id=13874
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