Implement deoptimization in the SSA compiler as a parallel move.

runtime/vm/flow_graph_compiler_x64.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_X64_H_
 #define VM_FLOW_GRAPH_COMPILER_X64_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_x64.h.
 #endif
@@ skipping 32 matching lines @@
   DescriptorList* pc_descriptors_list() const {
     return pc_descriptors_list_;
   }
   BlockEntryInstr* current_block() const { return current_block_; }
   void set_current_block(BlockEntryInstr* value) {
     current_block_ = value;
   }
   static bool CanOptimize();
   bool is_optimizing() const { return is_optimizing_; }
   const GrowableArray<BlockInfo*>& block_info() const { return block_info_; }
+  ParallelMoveResolver* parallel_move_resolver() {
+    return &parallel_move_resolver_;
+  }
 
   // Constructor is lighweight, major initialization work should occur here.
   // 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.
@@ skipping 244 matching lines @@
   // that should be used when deoptimizing we store it in this variable.
   // In future AddDeoptStub should be moved out of the instruction template.
   Environment* pending_deoptimization_env_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_X64_H_