Add some top level type inference rules for property gets.

pkg/front_end/testcases/inference/property_get_toplevel.dart.strong.expect

Index: pkg/front_end/testcases/inference/property_get_toplevel.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/property_get_toplevel.dart.strong.expect b/pkg/front_end/testcases/inference/property_get_toplevel.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..3cd111ac8748e149dcb09e6d40d6de006eb82f15
--- /dev/null
+++ b/pkg/front_end/testcases/inference/property_get_toplevel.dart.strong.expect
@@ -0,0 +1,22 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class C extends core::Object {
+  field core::int field = 0;
+  constructor •() → void
+    : super core::Object::•()
+    ;
+  get getter() → core::int
+    return 0;
+  method function() → core::int
+    return 0;
+}
+static field self::C c = new self::C::•();
+static field dynamic field_ref = self::c.{self::C::field};
+static field dynamic getter_ref = self::c.{self::C::getter};
+static field () → core::int function_ref = self::c.{self::C::function};
+static field dynamic field_ref_list = <core::int>[self::c.{self::C::field}];
+static field dynamic getter_ref_list = <core::int>[self::c.{self::C::getter}];
+static field core::List<() → core::int> function_ref_list = <() → core::int>[self::c.{self::C::function}];
+static method main() → dynamic {}