[turbofan] Fix lazy deopt for JSToNumber conversions in binary operations.

test/mjsunit/compiler/deopt-tonumber-binop.js

Index: test/mjsunit/compiler/deopt-tonumber-binop.js
diff --git a/test/mjsunit/compiler/deopt-tonumber-binop.js b/test/mjsunit/compiler/deopt-tonumber-binop.js
new file mode 100644
index 0000000000000000000000000000000000000000..c93ef9dfd5ae011dccf117710689a92cb1494493
--- /dev/null
+++ b/test/mjsunit/compiler/deopt-tonumber-binop.js
@@ -0,0 +1,40 @@
+// 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
+//
+var f = (function() {
+  "use asm";
+  function f(x, y) {
+    return x - y;
+  }
+  return f;
+})();
+
+var counter = 0;
+
+var deopt = { toString : function() {
+  %DeoptimizeFunction(f);
+  counter++;
+  return "2";
+} };
+
+var o = { toString : function() {
+  counter++;
+  return "1";
+} };
+
+counter = 0;
+assertEquals(1, f(deopt, o));
+assertEquals(2, counter);
+
+%OptimizeFunctionOnNextCall(f);
+counter = 0;
+assertEquals(-1, f(o, deopt));
+assertEquals(2, counter);
+
+%OptimizeFunctionOnNextCall(f);
+counter = 0;
+assertEquals(0, f(deopt, deopt));
+assertEquals(2, counter);