Externalize deoptimization reasons.

test/mjsunit/assert-opt-and-deopt.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 163 matching lines @@
 // Let's trigger optimization for another type.
 for (var i = 0; i < 5; i++) f("a");
 
 %OptimizeFunctionOnNextCall(f);
 f("b");
 
 tracker.AssertOptCount(f, 2);
 tracker.AssertIsOptimized(f, true);
 tracker.AssertDeoptHappened(f, true);
 tracker.AssertDeoptCount(f, 1);
+
+
+function deoptTest() {
+  function k(a) {
+    return a / 10;
+  }
+
+  function f(a) {
+    return k(a);
+  }
+
+  var tracker = new OptTracker();
+  tracker.CheckpointOptCount(f);
+
+  f(10);
+  %OptimizeFunctionOnNextCall(f);
+  f(10);
+
+  tracker.AssertOptCount(f, 1);
+  tracker.AssertIsOptimized(f, true);
+  tracker.AssertDeoptHappened(f, false);
+  tracker.AssertDeoptCount(f, 0);
+
+  try {
+    f('a');
+  } catch(e) {
+  }
+
+  tracker.AssertIsOptimized(f, false);
+  tracker.AssertDeoptHappened(f, true);
+  tracker.AssertDeoptCount(f, 1);
+}
+
+deoptTest();