[PATCH] [libcxx] Support UDTs convertible to arithmetic types in <cmath>

[Agustín Bergé]

Addressed review comments. Keep in mind that only `pow` is implemented completely, once we get that one right I'll update the others to follow.


http://reviews.llvm.org/D5942

Files:
  include/cmath
  include/type_traits
  test/std/numerics/c.math/cmath.pass.cpp

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