CallConstruct also gets call count information if megamorphic.

src/compiler/js-inlining-heuristic.cc

Index: src/compiler/js-inlining-heuristic.cc
diff --git a/src/compiler/js-inlining-heuristic.cc b/src/compiler/js-inlining-heuristic.cc
index 05307df7097ef2939bb5d0a4f9b59bc943dcdbec..c5ede0a35f73dad33a28a5dfffb2e94fdd340861 100644
--- a/src/compiler/js-inlining-heuristic.cc
+++ b/src/compiler/js-inlining-heuristic.cc
@@ -132,12 +132,8 @@ Reduction JSInliningHeuristic::Reduce(Node* node) {
     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();
     }
   }