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

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 14858)
+++ runtime/vm/object.h	(working copy)
@@ -2806,6 +2806,12 @@
 
   void set_deopt_reason(intptr_t reason) const;
 
+  bool is_closure_call() const {
+    return raw_ptr()->is_closure_call_ == 1;
+  }
+
+  void set_is_closure_call(bool value) const;
+
   intptr_t NumberOfChecks() const;
 
   static intptr_t InstanceSize() {
@@ -2828,6 +2834,10 @@
     return OFFSET_OF(RawICData, function_);
   }
 
+  static intptr_t is_closure_call_offset() {
+    return OFFSET_OF(RawICData, is_closure_call_);
+  }
+
   // Adding checks.
 
   // Adds one more class test to ICData. Length of 'classes' must be equal to