[crankshaft] Fix constant folding of HDiv instruction.

test/mjsunit/regress/regress-crbug-662367.js

+// Copyright 2016 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 --fold-constants
+
+var zero = 0;
+
+function f() {
+  return 0 / zero;
+}
+assertTrue(isNaN(f()));
+assertTrue(isNaN(f()));
+%OptimizeFunctionOnNextCall(f);
+assertTrue(isNaN(f()));
+
+function g() {
+  return -0 / zero;
+}
+assertTrue(isNaN(g()));
+assertTrue(isNaN(g()));
+%OptimizeFunctionOnNextCall(g);
+assertTrue(isNaN(g()));