Enable OSR optimization for functions with try-catch.

tests/language/try_catch_osr_test.dart

Index: tests/language/try_catch_osr_test.dart
===================================================================
--- tests/language/try_catch_osr_test.dart	(revision 0)
+++ tests/language/try_catch_osr_test.dart	(revision 0)
@@ -0,0 +1,102 @@
+// 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.
+// VMOptions=--optimization-counter-threshold=10
+
+// Test OSR in different places of a try-catch.
+
+import "package:expect/expect.dart";
+
+maythrow(x) {
+  try {
+    if (x == null) throw 42;
+    return 99;
+  } finally { }
+}
+
+f1() {
+  var s = 0, t = "abc";
+  for (var i = 0; i < 21; ++i) {
+    s += i;
+  }
+  try {
+    maythrow(null);
+  } catch (e) {
+    Expect.equals("abc", t);
+    Expect.equals(42, e);
+    s++;
+  }
+  return s;
+}
+
+f2([x = 1]) {
+  var s = 0, t = "abc";
+  try {
+    try {
+      for (var i = 0; i < 20; ++i) {
+        if (i == 18) maythrow(null);
+        s += x;
+      }
+    } catch (e) {
+      Expect.equals(1, x);
+      Expect.equals("abc", t);
+      Expect.equals(42, e);
+      s++;
+    }
+  } catch (e) { }
+  return s;
+}
+
+f3() {
+  var s = 0, t = "abc";
+  try {
+    maythrow(null);
+  } catch (e) {
+    Expect.equals("abc", t);
+    for (var i = 0; i < 21; ++i) {
+      s += i;
+    }
+    Expect.equals("abc", t);
+    Expect.equals(42, e);
+    return s;
+  }
+}
+
+f4() {
+  var s = 0, t = "abc";
+  try {
+    for (var i = 0; i < 21; ++i) {
+      if (i == 18) maythrow(null);
+      s += i;
+    }
+  } catch (e) {
+    Expect.equals("abc", t);
+    Expect.equals(42, e);
+    s++;
+  }
+  return s;
+}
+
+f5() {
+  var s, t = "abc";
+  try {
+    maythrow(null);
+  } catch (e) {
+    Expect.equals("abc", t);
+    Expect.equals(42, e);
+    s = 0;
+  }
+  for (var i = 0; i < 21; ++i) {
+    s += i;
+  }
+  Expect.equals("abc", t);
+  return s;
+}
+
+main() {
+  Expect.equals(211, f1());
+  Expect.equals(19, f2());
+  Expect.equals(210, f3());
+  Expect.equals(9 * 17 + 1, f4());
+  Expect.equals(210, f5());
+}