A64: Synchronize with r17525.

test/mjsunit/regress/regress-2980.js

Index: test/mjsunit/regress/regress-2980.js
diff --git a/src/harmony-math.js b/test/mjsunit/regress/regress-2980.js
similarity index 68%
copy from src/harmony-math.js
copy to test/mjsunit/regress/regress-2980.js
index a4d3f2e8a5e9c5936630571644605402dee1199d..071a73353a79aec11091cc97c117710d2fb36414 100644
--- a/src/harmony-math.js
+++ b/test/mjsunit/regress/regress-2980.js
@@ -25,36 +25,40 @@
 // (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;
-}
-
 
-// 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;
+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);
 
-function ExtendMath() {
-  %CheckIsBootstrapping();
+// Now the same thing with a nontrivial prototype chain.
 
-  // Set up the non-enumerable functions on the Math object.
-  InstallFunctions($Math, DONT_ENUM, $Array(
-    "sign", MathSign,
-    "trunc", MathTrunc
-  ));
+function test2(expected, holder) {
+  assertEquals(expected, holder.prop2);
 }
 
-ExtendMath();
+var holder2 = {}
+holder2.prop2 = "foo";
+holder2.__proto__ = null;
+function Receiver() {}
+Receiver.prototype = holder2;
+
+var rec2 = new Receiver();
+delete holder2.prop2;
+
+test2(undefined, rec2);
+test2(undefined, rec2);
+test2(undefined, rec2);
+holder2.prop2 = "bar";
+test2("bar", rec2);
+test2("bar", rec2);