Propagate this-specialization to regular (megamorphic) calls

runtime/vm/jit_optimizer.cc

Index: runtime/vm/jit_optimizer.cc
diff --git a/runtime/vm/jit_optimizer.cc b/runtime/vm/jit_optimizer.cc
index 719f359c116b6fc679b2f6a9c0a1275ad2fa4b60..25ffd3058e8077cebfa7cfedfa040ea53455e1cd 100644
--- a/runtime/vm/jit_optimizer.cc
+++ b/runtime/vm/jit_optimizer.cc
@@ -194,24 +194,26 @@ bool JitOptimizer::TryCreateICData(InstanceCallInstr* call) {
 
 const ICData& JitOptimizer::TrySpecializeICData(const ICData& ic_data,
                                                 intptr_t cid) {
-  ASSERT(ic_data.NumArgsTested() == 1);
+  Zone* zone = Thread::Current()->zone();
+  if (ic_data.NumArgsTested() != 1) return ic_data;
 
   if ((ic_data.NumberOfUsedChecks() == 1) && ic_data.HasReceiverClassId(cid)) {
     return ic_data;  // Nothing to do
   }
 
+  intptr_t count = 1;
   const Function& function =
-      Function::Handle(Z, ic_data.GetTargetForReceiverClassId(cid));
+      Function::Handle(zone, ic_data.GetTargetForReceiverClassId(cid, &count));
   // TODO(fschneider): Try looking up the function on the class if it is
   // not found in the ICData.
   if (!function.IsNull()) {
     const ICData& new_ic_data = ICData::ZoneHandle(
-        Z, ICData::New(Function::Handle(Z, ic_data.Owner()),
-                       String::Handle(Z, ic_data.target_name()),
-                       Object::empty_array(),  // Dummy argument descriptor.
-                       ic_data.deopt_id(), ic_data.NumArgsTested(), false));
+        zone, ICData::New(Function::Handle(zone, ic_data.Owner()),
+                          String::Handle(zone, ic_data.target_name()),
+                          Object::empty_array(),  // Dummy argument descriptor.
+                          ic_data.deopt_id(), ic_data.NumArgsTested(), false));
     new_ic_data.SetDeoptReasons(ic_data.DeoptReasons());
-    new_ic_data.AddReceiverCheck(cid, function);
+    new_ic_data.AddReceiverCheck(cid, function, count);
     return new_ic_data;
   }