header fix

Author: SteveBronder

stan/math/mix.hpp

@@ -9,19 +9,20 @@
 #include <stan/math/mix/fun.hpp>
 #include <stan/math/mix/functor.hpp>
 
+#include <stan/math/rev/constraint.hpp>
+#include <stan/math/rev/core.hpp>
+#include <stan/math/rev/meta.hpp>
+#include <stan/math/rev/fun.hpp>
+#include <stan/math/rev/functor.hpp>
+#include <stan/math/rev/prob.hpp>
+
 #include <stan/math/fwd/constraint.hpp>
 #include <stan/math/fwd/core.hpp>
 #include <stan/math/fwd/meta.hpp>
 #include <stan/math/fwd/fun.hpp>
 #include <stan/math/fwd/functor.hpp>
 #include <stan/math/fwd/prob.hpp>
 
-#include <stan/math/rev/constraint.hpp>
-#include <stan/math/rev/core.hpp>
-#include <stan/math/rev/meta.hpp>
-#include <stan/math/rev/fun.hpp>
-#include <stan/math/rev/functor.hpp>
-#include <stan/math/rev/prob.hpp>
 
 #ifdef STAN_OPENCL
 #include <stan/math/opencl/rev.hpp>