In optimized code use IC calls for instance calls that have no IC data instead of deoptimizing. The…

runtime/vm/flow_graph_compiler_x64.h

Index: runtime/vm/flow_graph_compiler_x64.h
===================================================================
--- runtime/vm/flow_graph_compiler_x64.h	(revision 14858)
+++ runtime/vm/flow_graph_compiler_x64.h	(working copy)
@@ -125,6 +125,14 @@
 
   void EmitComment(Instruction* instr);
 
+  void EmitOptimizedInstanceCall(ExternalLabel* target_label,
+                                 const ICData& ic_data,
+                                 const Array& arguments_descriptor,
+                                 intptr_t argument_count,
+                                 intptr_t deopt_id,
+                                 intptr_t token_pos,
+                                 LocationSummary* locs);
+
   void EmitInstanceCall(ExternalLabel* target_label,
                         const ICData& ic_data,
                         const Array& arguments_descriptor,
@@ -204,6 +212,8 @@
     return current_block_->try_index();
   }
 
+  bool may_reoptimize() const { return may_reoptimize_; }
+
   static Condition FlipCondition(Condition condition);
 
   static bool EvaluateCondition(Condition condition, intptr_t l, intptr_t r);
@@ -311,6 +321,8 @@
   GrowableArray<CompilerDeoptInfo*> deopt_infos_;
   GrowableArray<SlowPathCode*> slow_path_code_;
   const bool is_optimizing_;
+  // Set to true if optimized code has IC calls.
+  bool may_reoptimize_;
 
   const Bool& bool_true_;
   const Bool& bool_false_;