CallConstruct also gets call count information if megamorphic.

test/cctest/test-feedback-vector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/api.h"
 #include "src/debug/debug.h"
 #include "src/execution.h"
@@ skipping 272 matching lines @@
   v8::HandleScope scope(context->GetIsolate());
   Isolate* isolate = CcTest::i_isolate();
 
   // Make sure function f has a call that uses a type feedback slot.
   CompileRun(
       "function Foo() {}"
       "function f(a) { new a(); } f(Foo);");
   Handle<JSFunction> f = GetFunction("f");
   Handle<TypeFeedbackVector> feedback_vector =
       Handle<TypeFeedbackVector>(f->feedback_vector(), isolate);
+
   FeedbackVectorSlot slot(0);
+  CallICNexus nexus(feedback_vector, slot);
+  CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
+
   CHECK(feedback_vector->Get(slot)->IsWeakCell());
 
   CompileRun("f(Foo); f(Foo);");
-  FeedbackVectorSlot cslot(1);
-  CHECK(feedback_vector->Get(cslot)->IsSmi());
-  CHECK_EQ(3, Smi::cast(feedback_vector->Get(cslot))->value());
+  CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
+  CHECK_EQ(3, nexus.ExtractCallCount());
+
+  // Send the IC megamorphic, but we should still have incrementing counts.
+  CompileRun("f(function() {});");
+  CHECK_EQ(GENERIC, nexus.StateFromFeedback());
+  CHECK_EQ(4, nexus.ExtractCallCount());
 }
 
 TEST(VectorLoadICStates) {
   if (i::FLAG_always_opt) return;
   CcTest::InitializeVM();
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   Isolate* isolate = CcTest::i_isolate();
 
   // Make sure function f has a call that uses a type feedback slot.
@@ skipping 266 matching lines @@
   // There should be one IC slot.
   Handle<TypeFeedbackVector> feedback_vector(f->feedback_vector());
   FeedbackVectorHelper helper(feedback_vector);
   CHECK_EQ(1, helper.slot_count());
   FeedbackVectorSlot slot(0);
   StoreICNexus nexus(feedback_vector, slot);
   CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
 }
 
 }  // namespace