[turbofan] Avoid ToNumber conversions if they could deoptimize.

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

+// 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)));