Add optimized loads from ExternalUint8ClampedArrays.

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 741 matching lines @@
   switch (class_id) {
     case kArrayCid:
     case kImmutableArrayCid:
     case kGrowableObjectArrayCid:
     case kFloat32ArrayCid:
     case kFloat64ArrayCid:
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
     case kExternalUint8ArrayCid:
+    case kExternalUint8ClampedArrayCid:
     case kInt16ArrayCid:
     case kUint16ArrayCid:
       break;
     case kInt32ArrayCid:
     case kUint32ArrayCid:
       // Check if elements fit into a smi or the platform supports unboxed
       // mints.
       if ((kSmiBits < 32) && !FlowGraphCompiler::SupportsUnboxedMints()) {
         return false;
       }
@@ skipping 690 matching lines @@
           call->ReplaceWith(d2d_instr, current_iterator());
           RemovePushArguments(call);
         }
         return true;
       default:
         // Unsupported method.
         return false;
     }
   }
 
-  if (IsSupportedByteArrayCid(class_ids[0]) && ic_data.NumberOfChecks() == 1) {
+  if (IsSupportedByteArrayCid(class_ids[0]) &&
+      (ic_data.NumberOfChecks() == 1)) {
     Definition* array_op = NULL;
     switch (recognized_kind) {
       case MethodRecognizer::kByteArrayBaseGetInt8:
         array_op = BuildByteArrayViewLoad(call, class_ids[0], kInt8ArrayCid);
         break;
       case MethodRecognizer::kByteArrayBaseGetUint8:
         array_op = BuildByteArrayViewLoad(call, class_ids[0], kUint8ArrayCid);
         break;
       case MethodRecognizer::kByteArrayBaseGetInt16:
         array_op = BuildByteArrayViewLoad(call, class_ids[0], kInt16ArrayCid);
@@ skipping 3194 matching lines @@
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 
 }  // namespace dart