b f/i-1222 mix/scal/fun/nan_util.hpp added
b f/i-1222 mix/scal/fun/nan_util.hpp added

stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/stan,stan-dev/stan,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/stan,stan-dev/math,stan-dev/math,stan-dev/stan,stan-dev/stan,stan-dev/math