[turbofan] Avoid ToNumber conversions if they could deoptimize.

test/mjsunit/compiler/regress-to-number-binop-deopt.js

Index: test/mjsunit/compiler/regress-to-number-binop-deopt.js
diff --git a/test/mjsunit/compiler/regress-to-number-binop-deopt.js b/test/mjsunit/compiler/regress-to-number-binop-deopt.js
new file mode 100644
index 0000000000000000000000000000000000000000..f6b77d90829cf17587314d1fd0f2983698f4bdfa
--- /dev/null
+++ b/test/mjsunit/compiler/regress-to-number-binop-deopt.js
@@ -0,0 +1,25 @@
+// 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 deopt(f) {
+  return { valueOf : function() { %DeoptimizeFunction(f); return 1.1; } };
+}
+
+function or_zero(o) {
+  return o|0;
+}
+
+function multiply_one(o) {
+  return +o;
+}
+
+function multiply_one_symbol() {
+  return +Symbol();
+}
+
+assertThrows(multiply_one_symbol, TypeError);
+assertEquals(1, or_zero(deopt(or_zero)));
+assertEquals(1.1, multiply_one(deopt(multiply_one)));