message: comment of using Log1
diff: @@ -341,7 +341,10 @@ XlaOp ErfInv(XlaOp x) {
  0.00943887047f, 1.00167406f, 2.83297682f};
  auto one = ScalarLike(x, 1.0);
  - auto w = -Log1p(one - x * x);
  + //Computes logarithm of (1+arg). This function is more precise
  + //than the expression std::log(1+arg) if arg is close to zero.
  + // see ref. https://en.cppreference.com/w/cpp/numeric/math/log1p
  + auto w = -Log1p(- x * x);
  auto lt = Lt(w, ScalarLike(x, 5.0));
  auto coefficient = [&](int i) {
  