Throw NoSuchMethod or ArgumentError instead of generating a bailout, when we know the next instruct…

tests/language/bailout8_test.dart

Index: tests/language/bailout8_test.dart
===================================================================
--- tests/language/bailout8_test.dart	(revision 0)
+++ tests/language/bailout8_test.dart	(revision 0)
@@ -0,0 +1,27 @@
+// Copyright (c) 2013, 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.
+
+import "package:expect/expect.dart";
+
+var a;
+var b;
+
+bar() {
+  a = a == null ? 42 : new Object();
+  a += b;
+}
+
+foo() {
+  a = a == null ? new Object() : 42;
+  a--;
+}
+
+main() {
+  for (int i = 0; i < 10; i++) {
+    a = null;
+    Expect.throws(foo, (e) => e is NoSuchMethodError);
+    a = null;
+    Expect.throws(bar, (e) => e is ArgumentError);
+  }
+}