73c85c7725981585acf752a3a32aca6f50b304a0
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@167238 91177308-0d34-0410-b5e6-96231b3b80d8
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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android_external_libcxx
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