Add support for XMM registers in SSA code generation pipeline.

runtime/vm/flow_graph_optimizer.h

Index: runtime/vm/flow_graph_optimizer.h
diff --git a/runtime/vm/flow_graph_optimizer.h b/runtime/vm/flow_graph_optimizer.h
index f90b087296291748f259dcc3a7e568ab497b7367..09a0d95b0ff15f0dc8ebe79a1bd442770e48ade2 100644
--- a/runtime/vm/flow_graph_optimizer.h
+++ b/runtime/vm/flow_graph_optimizer.h
@@ -15,8 +15,9 @@ template <typename T> class DirectChainedHashMap;
 
 class FlowGraphOptimizer : public FlowGraphVisitor {
  public:
-  explicit FlowGraphOptimizer(const FlowGraph& flow_graph)
-      : FlowGraphVisitor(flow_graph.reverse_postorder()) {}
+  explicit FlowGraphOptimizer(FlowGraph* flow_graph)
+      : FlowGraphVisitor(flow_graph->reverse_postorder()),
+        flow_graph_(flow_graph) { }
   virtual ~FlowGraphOptimizer() {}
 
   void ApplyICData();
@@ -48,6 +49,20 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
 
   bool TryInlineInstanceMethod(BindInstr* instr, InstanceCallComp* comp);
 
+  void AddCheckClass(BindInstr* instr, InstanceCallComp* comp, Value* value);
+
+  BindInstr* InsertBefore(Instruction* instr,
+                          Computation* comp,
+                          Environment* env,
+                          BindInstr::UseKind use_kind);
+
+  BindInstr* InsertAfter(Instruction* instr,
+                         Computation* comp,
+                         Environment* env,
+                         BindInstr::UseKind use_kind);
+
+  FlowGraph* flow_graph_;
+
   DISALLOW_COPY_AND_ASSIGN(FlowGraphOptimizer);
 };