[builtins] Migrate Number predicates and make them optimizable.

test/mjsunit/compiler/number-isnan.js

Index: test/mjsunit/compiler/number-isnan.js
diff --git a/test/mjsunit/compiler/number-isnan.js b/test/mjsunit/compiler/number-isnan.js
new file mode 100644
index 0000000000000000000000000000000000000000..fb6bb6d741cfd7f4a310b4820d0c39bb2002e1f1
--- /dev/null
+++ b/test/mjsunit/compiler/number-isnan.js
@@ -0,0 +1,28 @@
+// 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
+
+function test(f) {
+  assertFalse(f(0));
+  assertFalse(f(Number.MIN_VALUE));
+  assertFalse(f(Number.MAX_VALUE));
+  assertFalse(f(Number.MIN_SAFE_INTEGER - 13));
+  assertFalse(f(Number.MAX_SAFE_INTEGER + 23));
+  assertTrue(f(Number.NaN));
+  assertFalse(f(Number.POSITIVE_INFINITY));
+  assertFalse(f(Number.NEGATIVE_INFINITY));
+  assertFalse(f(Number.EPSILON));
+  assertFalse(f(1 / 0));
+  assertFalse(f(-1 / 0));
+}
+
+function f(x) {
+  return Number.isNaN(+x);
+}
+
+test(f);
+test(f);
+%OptimizeFunctionOnNextCall(f);
+test(f);