Support all fast elements kinds in the major array operations.

test/mjsunit/array-slice.js

Index: test/mjsunit/array-slice.js
diff --git a/test/mjsunit/array-slice.js b/test/mjsunit/array-slice.js
index 5ae31dc5278ec4c90a4166f91030874c8c06663c..ae0e3bc1ef6fb4793866ce490d951952c0198097 100644
--- a/test/mjsunit/array-slice.js
+++ b/test/mjsunit/array-slice.js
@@ -290,3 +290,15 @@
 
   func('a', 'b', 'c');
 })();
+
+// Check slicing of holey objects with elements in the prototype
+(function() {
+  function f() {
+    delete arguments[1];
+    arguments.__proto__[1] = 5;
+    var result = Array.prototype.slice.call(arguments);
+    delete arguments.__proto__[1];
+    assertEquals([1,5,3], result);
+  }
+  f(1,2,3);
+})();