Collect type feedback for fields.

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 542 matching lines @@
     }
     if (parsed_function().function().kind() == RawFunction::kImplicitSetter) {
       // An implicit setter must have a specific AST structure.
       // Sequence node has one store node and one return NULL node.
       const SequenceNode& sequence_node = *parsed_function().node_sequence();
       ASSERT(sequence_node.length() == 2);
       ASSERT(sequence_node.NodeAt(0)->IsStoreInstanceFieldNode());
       ASSERT(sequence_node.NodeAt(1)->IsReturnNode());
       const StoreInstanceFieldNode& store_node =
           *sequence_node.NodeAt(0)->AsStoreInstanceFieldNode();
-      GenerateInlinedSetter(store_node.field().Offset());
-      return true;
+      if (store_node.field().guarded_cid() == kDynamicCid) {
+        GenerateInlinedSetter(store_node.field().Offset());
+        return true;
+      }
     }
   }
   // Even if an intrinsified version of the function was successfully
   // generated, it may fall through to the non-intrinsified method body.
   return Intrinsifier::Intrinsify(parsed_function().function(), assembler());
 }
 
 
 void FlowGraphCompiler::GenerateInstanceCall(
     intptr_t deopt_id,
@@ skipping 490 matching lines @@
     if (i != largest_ix) {
       // Swap.
       CidTarget temp = (*sorted)[i];
       (*sorted)[i] = (*sorted)[largest_ix];
       (*sorted)[largest_ix] = temp;
     }
   }
 }
 
 }  // namespace dart