A64: Synchronize with r17525.

test/mjsunit/regress/regress-2980.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-'use strict';
 
-// ES6 draft 09-27-13, section 20.2.2.28.
-function MathSign(x) {
-  x = TO_NUMBER_INLINE(x);
-  if (x > 0) return 1;
-  if (x < 0) return -1;
-  if (x === 0) return x;
-  return NAN;
+function test(expected, holder) {
+  assertEquals(expected, holder.property);
 }
 
+var holder = {}
+holder.__proto__ = null;
+holder.property = "foo";
+delete holder.property;
+test(undefined, holder);
+test(undefined, holder);
+test(undefined, holder);
+holder.property = "bar";
+test("bar", holder);
+test("bar", holder);
 
-// ES6 draft 09-27-13, section 20.2.2.34.
-function MathTrunc(x) {
-  x = TO_NUMBER_INLINE(x);
-  if (x > 0) return MathFloor(x);
-  if (x < 0) return MathCeil(x);
-  if (x === 0) return x;
-  return NAN;
+// Now the same thing with a nontrivial prototype chain.
+
+function test2(expected, holder) {
+  assertEquals(expected, holder.prop2);
 }
 
+var holder2 = {}
+holder2.prop2 = "foo";
+holder2.__proto__ = null;
+function Receiver() {}
+Receiver.prototype = holder2;
 
-function ExtendMath() {
-  %CheckIsBootstrapping();
+var rec2 = new Receiver();
+delete holder2.prop2;
 
-  // Set up the non-enumerable functions on the Math object.
-  InstallFunctions($Math, DONT_ENUM, $Array(
-    "sign", MathSign,
-    "trunc", MathTrunc
-  ));
-}
-
-ExtendMath();
+test2(undefined, rec2);
+test2(undefined, rec2);
+test2(undefined, rec2);
+holder2.prop2 = "bar";
+test2("bar", rec2);
+test2("bar", rec2);