Optimizes 'as' operation in similar way as 'instanceof': collect type feedback in unoptimized mode…

runtime/vm/flow_graph_optimizer.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_FLOW_GRAPH_OPTIMIZER_H_
 #define VM_FLOW_GRAPH_OPTIMIZER_H_
 
 #include "vm/intermediate_language.h"
 #include "vm/flow_graph.h"
 
@@ skipping 62 matching lines @@
 
   bool TryReplaceWithBinaryOp(InstanceCallInstr* call, Token::Kind op_kind);
   bool TryReplaceWithUnaryOp(InstanceCallInstr* call, Token::Kind op_kind);
 
   bool TryInlineInstanceGetter(InstanceCallInstr* call);
   bool TryInlineInstanceSetter(InstanceCallInstr* call,
                                const ICData& unary_ic_data);
 
   bool TryInlineInstanceMethod(InstanceCallInstr* call);
   void ReplaceWithInstanceOf(InstanceCallInstr* instr);
+  void ReplaceWithTypeCast(InstanceCallInstr* instr);
 
   LoadIndexedInstr* BuildStringCodeUnitAt(InstanceCallInstr* call,
                                           intptr_t cid);
 
   bool BuildByteArrayViewLoad(InstanceCallInstr* call,
                               intptr_t receiver_cid,
                               intptr_t view_cid);
   bool BuildByteArrayViewStore(InstanceCallInstr* call,
                                intptr_t receiver_cid,
                                intptr_t view_cid);
@@ skipping 196 matching lines @@
   // inputs.
   static BranchInstr* CloneBranch(BranchInstr* branch,
                                   Value* left,
                                   Value* right);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_OPTIMIZER_H_