Type of InstanceMirror on class should still be a ClassMirror when class has call method

tests/lib/mirrors/function_apply_test.dart

+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library lib;
+
+@MirrorsUsed(targets: "lib")
+import "dart:mirrors";
+
+import "package:expect/expect.dart";
+
+class A {
+  call(int x) => 123 + x;
+  bar(int y) => 321 + y;
+}
+
+foo(int y) => 456 + y;
+
+main() {
+  // Static function.
+  ClosureMirror f1 = reflect(foo);
+  Expect.equals(1456, f1.apply([1000]).reflectee);
+
+  // Local declaration.
+  chomp(int z) => z + 42;
+  ClosureMirror f2 = reflect(chomp);
+  Expect.equals(1042, f2.apply([1000]).reflectee);
+
+  // Local expression.
+  ClosureMirror f3 = reflect((u) => u + 987);
+  Expect.equals(1987, f3.apply([1000]).reflectee);
+
+  // Instance property extraction.
+  ClosureMirror f4 = reflect(new A().bar);
+  Expect.equals(1321, f4.apply([1000]).reflectee);
+
+  // Instance implementing Function via call method.
+  ClosureMirror f5 = reflect(new A());
+  Expect.equals(1123, f5.apply([1000]).reflectee);
+
+}