Fix try-catch optimizer.

tests/language/try_catch_regress_27483_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.
+// Dart test program for testing try/catch statement without any exceptions
+// being thrown.
+// VMOptions=--optimization-counter-threshold=100 --no-background-compilation --enable-inlining-annotations
+
+// Test local variables updated inside try-catch.
+
+import "package:expect/expect.dart";
+
+const noInline = "NeverInline";
+
+@noInline
+m1(int b) {
+  if (b == 1) throw 123;
+}
+
+
+@noInline
+m2(int b) {
+  if (b == 2) throw 456;
+}
+
+
+@noInline
+test(b) {
+  var state = 0;
+  try {
+    state++;
+    m1(b);
+    state++;
+    m2(b);
+    state++;
+  } on dynamic catch (e, s) {
+    if (b == 1 && state != 1) throw "fail1";
+    if (b == 2 && state != 2) throw "fail2";
+    if (b == 3 && state != 3) throw "fail3";
+    return e;
+  } 
+  return "no throw";
+}
+
+main() {
+  for (var i=0; i<300; i++) {
+    Expect.equals("no throw", test(0));
+  }
+  Expect.equals("no throw", test(0));
+  Expect.equals(123, test(1));
+  Expect.equals(456, test(2));
+}