DBC: Fix bugs with array allocation

tests/language/vm/optimized_list_constructor_test.dart

+// Copyright (c) 2016, 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.
+// Test various optimizations and deoptimizations of optimizing compiler..
+// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
+
+import "package:expect/expect.dart";
+
+// Test correct throwing of ArgumentError in optimized code.
+
+test() {
+  try {
+    var r = new List<int>(-1);
+    Expect.isTrue(false);  // Unreachable.
+  } on RangeError {
+    return true;
+  }
+  Expect.isTrue(false);  // Unreachable.
+}
+
+main() {
+  for (var i = 0; i < 20; i++) {
+    Expect.isTrue(test());
+  }
+}
+