Fix compiler crash when we declare several (global) variables, but only define some of them.

tests/compiler/dart2js_extra/multi_global_def_single_instantiation_test.dart

Index: tests/compiler/dart2js_extra/multi_global_def_single_instantiation_test.dart
diff --git a/runtime/tests/vm/dart/hello_fuchsia_test.dart b/tests/compiler/dart2js_extra/multi_global_def_single_instantiation_test.dart
similarity index 81%
copy from runtime/tests/vm/dart/hello_fuchsia_test.dart
copy to tests/compiler/dart2js_extra/multi_global_def_single_instantiation_test.dart
index 501ffe759fecb0e616b46588a6148b28963ac47a..f118b61aef8e7b7e358a0cb96c0dcd371240858e 100644
--- a/runtime/tests/vm/dart/hello_fuchsia_test.dart
+++ b/tests/compiler/dart2js_extra/multi_global_def_single_instantiation_test.dart
@@ -2,6 +2,5 @@
 // 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.
 
-main() {
-  print("Hello, Fuchsia!");
-}
+var y, w, z, x = [], q, r = [];
+main() => [x, r];