Amend DataView, ArrayBuffer, and TypedArray methods to use ToIndex.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 72ca092f5123c0f4920b17bba638594b49612c17..dd7c1dd7da61980807d1370a2ab40b079e146c35 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1177,6 +1177,10 @@ class Object {
   MUST_USE_RESULT static MaybeHandle<Object> ToLength(Isolate* isolate,
                                                       Handle<Object> input);
 
+  // ES6 section 7.1.17 ToIndex
+  MUST_USE_RESULT static MaybeHandle<Object> ToIndex(Isolate* isolate,
+                                                     Handle<Object> input);
+
   // ES6 section 7.3.9 GetMethod
   MUST_USE_RESULT static MaybeHandle<Object> GetMethod(
       Handle<JSReceiver> receiver, Handle<Name> name);