Support for multiple register values

runtime/vm/flow_graph.h

Index: runtime/vm/flow_graph.h
diff --git a/runtime/vm/flow_graph.h b/runtime/vm/flow_graph.h
index 8b134b3604d3d2cf55a75a3db3eb10fd0d22c9d6..1ec11ea7d105f48d2fe6b803d4c69c0f182d7994 100644
--- a/runtime/vm/flow_graph.h
+++ b/runtime/vm/flow_graph.h
@@ -120,6 +120,14 @@ class FlowGraph : public ZoneAllocated {
 
   intptr_t alloc_ssa_temp_index() { return current_ssa_temp_index_++; }
 
+  void AllocateSSAIndexes(Definition* def) {
+    ASSERT(def);
+    def->set_ssa_temp_index(alloc_ssa_temp_index());
+    if (def->RequiresPairSSAIndex()) {
+      def->set_pair_ssa_index(alloc_ssa_temp_index());
+    }
+  }
+
   intptr_t InstructionCount() const;
 
   ConstantInstr* GetConstant(const Object& object);