Test for deferred prefix dependent code invalidation

tests/language/deferred_load_inval_code_test.dart

+
+// Copyright (c) 2014, 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.
+//
+// VMOptions=--optimization-counter-threshold=100
+
+import "deferred_load_inval_code_lib.dart" deferred as d;
+
+bool loaded = false;
+
+var x = 0;
+
+bla() {
+  if (loaded) {
+    // Loading the library should have invalidated the optimized
+    // code containing the NSME. Now expect this call to succeed.
+    d.foo();
+  } else {
+    // Do some "busy work" to trigger optimization.
+    for (var i = 0; i < 100; i++) {
+      x++;
+    }
+  }
+}
+
+warmup() {
+  for (int i = 1; i < 1000; i++) {
+    bla();
+  }
+}
+
+main() {
+  warmup();
+  d.loadLibrary().then((_) {
+    loaded = true;
+    bla();
+  });
+}