Add Test of void function with pointer arg

test/Gradient/Pointers.C

@@ -512,6 +512,24 @@ double cStyleMemoryAlloc(double x, size_t n) {
 // CHECK-NEXT:     free(_d_t);
 // CHECK-NEXT: }
 
+void pointerArgOut(double* p) {
+  *p *= *p;
+}
+
+// CHECK: void pointerArgOut_grad(double *p, clad::array_ref<double> _d_p) {
+// CHECK-NEXT:    * _d_p = 1;
+// CHECK-NEXT:    double _t0;
+// CHECK-NEXT:    _t0 = *p;
+// CHECK-NEXT:    *p *= *p;
+// CHECK-NEXT:    {
+// CHECK-NEXT:        *p = _t0;
+// CHECK-NEXT:        double _r_d0 = * _d_p;
+// CHECK-NEXT:        * _d_p -= _r_d0;
+// CHECK-NEXT:        * _d_p += _r_d0 * *p;
+// CHECK-NEXT:        * _d_p += *p * _r_d0;
+// CHECK-NEXT:    }
+// CHECK-NEXT:}
+
 #define NON_MEM_FN_TEST(var)\
 res[0]=0;\
 var.execute(5,res);\
@@ -621,4 +639,10 @@ int main() {
   d_x = 0;
   d_cStyleMemoryAlloc.execute(5, 7, &d_x);
   printf("%.2f\n", d_x); // CHECK-EXEC: 4.00
+
+  auto d_pointerArgOut = clad::gradient(pointerArgOut);
+  double *p = new double(5);
+  double d_p;
+  d_pointerArgOut.execute(p, &d_p);
+  printf("%.2f\n", d_p); // CHECK-EXEC: 10.00
 }