Add type inference for super property gets.

pkg/front_end/testcases/inference/super_property_get.dart.outline.expect

Index: pkg/front_end/testcases/inference/super_property_get.dart.outline.expect
diff --git a/pkg/front_end/testcases/inference/super_property_get.dart.outline.expect b/pkg/front_end/testcases/inference/super_property_get.dart.outline.expect
new file mode 100644
index 0000000000000000000000000000000000000000..b5e0babaa96e5eb8ad7ab7f3bd1eb13d39343b4e
--- /dev/null
+++ b/pkg/front_end/testcases/inference/super_property_get.dart.outline.expect
@@ -0,0 +1,17 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class C extends core::Object {
+  field dynamic x;
+  constructor •() → void
+    ;
+}
+class D extends self::C {
+  constructor •() → void
+    ;
+  method g() → void
+    ;
+}
+static method main() → dynamic
+  ;