Fix deoptimzation bug in hoisting smi operation out of loops.

tests/language/deopt_smi_op.dart

+// Copyright (c) 2011, 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 deoptimization on an optimistically hoisted smi check.
+
+// Test hoisted smi operation with deoptimization.
+
+foo(h)  {
+  var x;
+  for (var i=0; i<3; i++) {
+    x = h * 100000;

[Vyacheslav Egorov (Google), 2012/10/24 14:53:00]

Please cover all instructions with tests.

[Florian Schneider, 2012/10/24 18:00:22]

Done. Added unary minus. Shl has only lazy deoptimization.

+  }
+  return x;
+}
+
+main() {
+  for (var i=0; i<10000; i++) foo(10);
+  Expect.equals(1000000, foo(10));
+  Expect.equals(100000000000, foo(1000000));
+}