Implement deoptimization in the SSA compiler as a parallel move.

runtime/vm/flow_graph_compiler_ia32.h

Index: runtime/vm/flow_graph_compiler_ia32.h
diff --git a/runtime/vm/flow_graph_compiler_ia32.h b/runtime/vm/flow_graph_compiler_ia32.h
index 1376f980955aa9b27a8e1d554067b3cd01cda83f..6b9caaa52b2afcb022843a334a6376c2790dff7d 100644
--- a/runtime/vm/flow_graph_compiler_ia32.h
+++ b/runtime/vm/flow_graph_compiler_ia32.h
@@ -50,6 +50,9 @@ class FlowGraphCompiler : public ValueObject {
   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.