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

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
@@ skipping 923 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 intptr_t FlowGraphCompiler::ElementSizeFor(intptr_t cid) {
+  if (RawObject::IsExternalTypedDataClassId(cid)) {
+    return ExternalTypedData::ElementSizeInBytes(cid);
+  } else if (RawObject::IsTypedDataClassId(cid)) {
+    return TypedData::ElementSizeInBytes(cid);
+  }
   switch (cid) {
     case kArrayCid:
     case kImmutableArrayCid:
       return Array::kBytesPerElement;
     case kFloat32ArrayCid:
       return Float32Array::kBytesPerElement;
     case kFloat64ArrayCid:
       return Float64Array::kBytesPerElement;
     case kInt8ArrayCid:
       return Int8Array::kBytesPerElement;
@@ skipping 18 matching lines @@
     case kExternalUint8ClampedArrayCid:
       return ExternalUint8ClampedArray::kBytesPerElement;
     default:
       UNIMPLEMENTED();
       return 0;
   }
 }
 
 
 intptr_t FlowGraphCompiler::DataOffsetFor(intptr_t cid) {
+  if (RawObject::IsExternalTypedDataClassId(cid)) {
+    // Elements start at offset 0 of the external data.
+    return 0;
+  }
+  if (RawObject::IsTypedDataClassId(cid)) {
+    return TypedData::data_offset();
+  }
   switch (cid) {
     case kArrayCid:
     case kImmutableArrayCid:
       return Array::data_offset();
     case kFloat32ArrayCid:
       return Float32Array::data_offset();
     case kFloat64ArrayCid:
       return Float64Array::data_offset();
     case kInt8ArrayCid:
       return Int8Array::data_offset();
@@ skipping 73 matching lines @@
     if (i != largest_ix) {
       // Swap.
       CidTarget temp = (*sorted)[i];
       (*sorted)[i] = (*sorted)[largest_ix];
       (*sorted)[largest_ix] = temp;
     }
   }
 }
 
 }  // namespace dart