Avoid using %_CallFunction if the receiver doesn't change.

src/harmony-typedarray.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 197 matching lines @@
 // ES6 draft 05-18-15, section 22.2.3.25
 function TypedArraySort(comparefn) {
   if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   if (IS_UNDEFINED(comparefn)) {
     comparefn = TypedArrayComparefn;
   }
 
-  return %_CallFunction(this, length, comparefn, InnerArraySort);
+  return InnerArraySort(this, length, comparefn);
 }
 
 
 // ES6 section 22.2.3.13
 function TypedArrayIndexOf(element, index) {
   if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
-
-  return %_CallFunction(this, element, index, length, InnerArrayIndexOf);
+  return InnerArrayIndexOf(this, element, index, length);
 }
 %FunctionSetLength(TypedArrayIndexOf, 1);
 
 
 // ES6 section 22.2.3.16
 function TypedArrayLastIndexOf(element, index) {
   if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
-  return %_CallFunction(this, element, index, length,
-                        %_ArgumentsLength(), InnerArrayLastIndexOf);
+  return InnerArrayLastIndexOf(this, element, index, length,
+                        %_ArgumentsLength());
 }
 %FunctionSetLength(TypedArrayLastIndexOf, 1);
 
 
 // ES6 draft 07-15-13, section 22.2.3.18
 function TypedArrayMap(predicate, thisArg) {
   if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
 
   // TODO(littledan): Preallocate rather than making an intermediate
   // InternalArray, for better performance.
@@ skipping 155 matching lines @@
     "some", TypedArraySome,
     "sort", TypedArraySort,
     "toString", TypedArrayToString,
     "toLocaleString", TypedArrayToLocaleString
   ]);
 endmacro
 
 TYPED_ARRAYS(EXTEND_TYPED_ARRAY)
 
 })