CallConstruct also gets call count information if megamorphic.

src/compiler/js-inlining-heuristic.cc

 // Copyright 2015 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/compiler/js-inlining-heuristic.h"
 
 #include "src/compilation-info.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/simplified-operator.h"
@@ skipping 114 matching lines @@
   if (node->opcode() == IrOpcode::kJSCallFunction) {
     CallFunctionParameters p = CallFunctionParametersOf(node->op());
     if (p.feedback().IsValid()) {
       CallICNexus nexus(p.feedback().vector(), p.feedback().slot());
       candidate.calls = nexus.ExtractCallCount();
     }
   } else {
     DCHECK_EQ(IrOpcode::kJSCallConstruct, node->opcode());
     CallConstructParameters p = CallConstructParametersOf(node->op());
     if (p.feedback().IsValid()) {
-      int const extra_index =
-          p.feedback().vector()->GetIndex(p.feedback().slot()) + 1;
-      Object* feedback_extra = p.feedback().vector()->get(extra_index);
-      if (feedback_extra->IsSmi()) {
-        candidate.calls = Smi::cast(feedback_extra)->value();
-      }
+      CallICNexus nexus(p.feedback().vector(), p.feedback().slot());
+      candidate.calls = nexus.ExtractCallCount();
     }
   }
 
   // Handling of special inlining modes right away:
   //  - For restricted inlining: stop all handling at this point.
   //  - For stressing inlining: immediately handle all functions.
   switch (mode_) {
     case kRestrictedInlining:
       return NoChange();
     case kStressInlining:
@@ skipping 158 matching lines @@
   return jsgraph()->common();
 }
 
 SimplifiedOperatorBuilder* JSInliningHeuristic::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8