Optimize TypedData operators [] and []= in the same way as ScalarList.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 4945 matching lines @@
   TYPED_GETTER_SETTER(Uint32, uint32_t)
   TYPED_GETTER_SETTER(Int64, int64_t)
   TYPED_GETTER_SETTER(Uint64, uint64_t)
   TYPED_GETTER_SETTER(Float32, float)
   TYPED_GETTER_SETTER(Float64, double)
 
   static intptr_t length_offset() {
     return OFFSET_OF(RawTypedData, length_);
   }
 
+  static intptr_t data_offset() {
+    return OFFSET_OF(RawTypedData, data_);
+  }
+
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawTypedData) == OFFSET_OF(RawTypedData, data_));
     return 0;
   }
 
   static intptr_t InstanceSize(intptr_t lengthInBytes) {
     ASSERT(0 <= lengthInBytes && lengthInBytes <= kSmiMax);
     return RoundedAllocationSize(sizeof(RawTypedData) + lengthInBytes);
   }
 
@@ skipping 1853 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_