Fix top level type inference for binary operators.

pkg/front_end/testcases/inference/infer_binary_int_double.dart

Index: pkg/front_end/testcases/inference/infer_binary_int_double.dart
diff --git a/pkg/front_end/testcases/inference/infer_binary_int_double.dart b/pkg/front_end/testcases/inference/infer_binary_int_double.dart
index 4b8f9066d87c6a199e3c04e52b703b188a3fb384..7d85e627297773b4d1ddbe700800dd7022ceffde 100644
--- a/pkg/front_end/testcases/inference/infer_binary_int_double.dart
+++ b/pkg/front_end/testcases/inference/infer_binary_int_double.dart
@@ -10,10 +10,25 @@ var /*@topType=bool*/ a_notEqual = 1 /*@target=num::==*/ != 2.0;
 var /*@topType=double*/ a_add = 1 /*@target=num::+*/ + 2.0;
 var /*@topType=double*/ a_subtract = 1 /*@target=num::-*/ - 2.0;
 var /*@topType=double*/ a_multiply = 1 /*@target=num::**/ * 2.0;
-var /*@topType=num*/ a_divide = 1 /*@target=num::/ */ / 2.0;
+var /*@topType=double*/ a_divide = 1 /*@target=num::/ */ / 2.0;
 var /*@topType=int*/ a_floorDivide = 1 /*@target=num::~/ */ ~/ 2.0;
 var /*@topType=bool*/ a_greater = 1 /*@target=num::>*/ > 2.0;
 var /*@topType=bool*/ a_less = 1 /*@target=num::<*/ < 2.0;
 var /*@topType=bool*/ a_greaterEqual = 1 /*@target=num::>=*/ >= 2.0;
 var /*@topType=bool*/ a_lessEqual = 1 /*@target=num::<=*/ <= 2.0;
 var /*@topType=double*/ a_modulo = 1 /*@target=num::%*/ % 2.0;
+
+main() {
+  a_equal;
+  a_notEqual;
+  a_add;
+  a_subtract;
+  a_multiply;
+  a_divide;
+  a_floorDivide;
+  a_greater;
+  a_less;
+  a_greaterEqual;
+  a_lessEqual;
+  a_modulo;
+}