Fix inferInvocation for top level inference.

pkg/front_end/testcases/inference/downwards_inference_inside_top_level_2.dart.strong.expect

Index: pkg/front_end/testcases/inference/downwards_inference_inside_top_level_2.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/downwards_inference_inside_top_level_2.dart.strong.expect b/pkg/front_end/testcases/inference/downwards_inference_inside_top_level_2.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..5159466f60da4698bd5bb00f52065f2f944d7124
--- /dev/null
+++ b/pkg/front_end/testcases/inference/downwards_inference_inside_top_level_2.dart.strong.expect
@@ -0,0 +1,12 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class A<T extends core::Object> extends core::Object {
+  constructor •(self::A::T x) → void
+    : super core::Object::•()
+    ;
+}
+static field core::List<self::A<core::int>> t1 = <self::A<core::int>>[new self::A::•<core::int>(1)];
+static field core::List<self::A<dynamic>> t2 = <self::A<dynamic>>[new self::A::•<dynamic>(2)];
+static method main() → dynamic {}