Add __device__ to needful functions for promote-free.

src/math_functions.cpp

@@ -202,7 +202,8 @@ __device__ long long int llroundf(float x)
     int y = hc::precise_math::roundf(x);
     long long int z = y;
     return z;
-}__device__ float log10f(float x)
+}
+__device__ float log10f(float x)
 {
     return hc::precise_math::log10f(x);
 }