Create SendStructure for unary and binary in resolution.

pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart

Index: pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart
diff --git a/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart b/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart
index f321037e7859e8a63e9e2fb2248fc5ad3415074d..c8674b74789bec0f94a0e5faaab8945af02908aa 100644
--- a/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart
+++ b/pkg/compiler/lib/src/inferrer/simple_types_inferrer.dart
@@ -1407,6 +1407,18 @@ class SimpleTypeInferrerVisitor<T>
       MethodElement method,
       ast.Node argument,
       _) {
+    // TODO(johnniwinther): Special case ==.
+    return handleSuperMethodInvoke(
+        node, method, analyzeArguments(node.arguments));
+  }
+
+  @override
+  T visitSuperNotEquals(
+      ast.Send node,
+      MethodElement method,
+      ast.Node argument,
+      _) {
+    // TODO(johnniwinther): Special case !=.
     return handleSuperMethodInvoke(
         node, method, analyzeArguments(node.arguments));
   }