[es6] Array.prototype.find and findIndex should include holes

src/harmony-array.js

Index: src/harmony-array.js
diff --git a/src/harmony-array.js b/src/harmony-array.js
index 5df1abde0ff05d60afdb8d54abfc66572333c570..51e2d01b50147ded30436174685b23aca3484ac9 100644
--- a/src/harmony-array.js
+++ b/src/harmony-array.js
@@ -100,12 +100,10 @@ function InnerArrayFind(predicate, thisArg, array, length) {
   }
 
   for (var i = 0; i < length; i++) {
-    if (i in array) {
-      var element = array[i];
-      var newThisArg = needs_wrapper ? $toObject(thisArg) : thisArg;
-      if (%_CallFunction(newThisArg, element, i, array, predicate)) {
-        return element;
-      }
+    var element = array[i];
+    var newThisArg = needs_wrapper ? $toObject(thisArg) : thisArg;
+    if (%_CallFunction(newThisArg, element, i, array, predicate)) {
+      return element;
     }
   }
 
@@ -135,12 +133,10 @@ function InnerArrayFindIndex(predicate, thisArg, array, length) {
   }
 
   for (var i = 0; i < length; i++) {
-    if (i in array) {
-      var element = array[i];
-      var newThisArg = needs_wrapper ? $toObject(thisArg) : thisArg;
-      if (%_CallFunction(newThisArg, element, i, array, predicate)) {
-        return i;
-      }
+    var element = array[i];
+    var newThisArg = needs_wrapper ? $toObject(thisArg) : thisArg;
+    if (%_CallFunction(newThisArg, element, i, array, predicate)) {
+      return i;
     }
   }