Partially revert r26703 and omit regular code generation for implicit accessors.

runtime/vm/flow_graph_compiler.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_COMPILER_H_
 #define VM_FLOW_GRAPH_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_descriptors.h"
@@ skipping 310 matching lines @@
   // This makes it easier to measure time spent in the compiler.
   void InitCompiler();
 
   void CompileGraph();
 
   void VisitBlocks();
 
   // Bail out of the flow graph compiler. Does not return to the caller.
   void Bailout(const char* reason);
 
-  void TryIntrinsify();
+  // Returns 'true' if regular code generation should be skipped.
+  bool TryIntrinsify();
 
   void GenerateRuntimeCall(intptr_t token_pos,
                            intptr_t deopt_id,
                            const RuntimeEntry& entry,
                            intptr_t argument_count,
                            LocationSummary* locs);
 
   void GenerateCall(intptr_t token_pos,
                     const StubEntry& stub_entry,
                     RawPcDescriptors::Kind kind,
@@ skipping 394 matching lines @@
   Array& inlined_code_intervals_;
   const GrowableArray<const Function*>& inline_id_to_function_;
   const GrowableArray<intptr_t>& caller_inline_id_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_H_