[runtime] Remove receiver==holder check in IntegerIndexedExotic lookup

test/mjsunit/regress/regress-integer-indexed-element.js

Index: test/mjsunit/regress/regress-integer-indexed-element.js
diff --git a/test/mjsunit/regress/regress-integer-indexed-element.js b/test/mjsunit/regress/regress-integer-indexed-element.js
index f68c437637fff1537fed6519865b9a4bc2fa3578..1bae2d06f5793c57913ea44ab4dc333d0f593c24 100644
--- a/test/mjsunit/regress/regress-integer-indexed-element.js
+++ b/test/mjsunit/regress/regress-integer-indexed-element.js
@@ -4,7 +4,7 @@
 
 var o = {__proto__:new Int32Array(100)};
 Object.prototype[1.3] = 10;
-assertEquals(10, o[1.3]);
+assertEquals(undefined, o[1.3]);
 
 var o = new Int32Array(100);
 var o2 = new Int32Array(200);