Add test for deoptimization bug.

test/mjsunit/compiler/deopt-bool.js

Index: test/mjsunit/compiler/deopt-bool.js
diff --git a/test/mjsunit/compiler/deopt-bool.js b/test/mjsunit/compiler/deopt-bool.js
new file mode 100644
index 0000000000000000000000000000000000000000..13a4a97034410a1b444214744b5d706fe4497617
--- /dev/null
+++ b/test/mjsunit/compiler/deopt-bool.js
@@ -0,0 +1,28 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+function foo(a, b) {
+  var passed = a == 3;
+  if (passed) {
+    if (passed) {
+      passed = b == 4;
+    }
+  }
+  %DeoptimizeFunction(foo);
+  return passed;
+}
+
+assertTrue(foo(3, 4));
+assertTrue(foo(3, 4));
+assertFalse(foo(3.1, 4));
+assertFalse(foo(3, 4.1));
+
+%OptimizeFunctionOnNextCall(foo);
+
+assertTrue(foo(3, 4));
+assertTrue(foo(3, 4));
+assertFalse(foo(3.1, 4));
+assertFalse(foo(3, 4.1));