[libc++] Fix buggy numerics of tanh(complex) at inf
Because: lim[x->inf, tanh(x+iy)] = 1 lim[x->-inf, tanh(x+iy)] = -1 See also https://github.com/NVIDIA/libcudacxx/pull/210 Differential Revision: https://reviews.llvm.org/D112252
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