Provide call counts for constructor calls, surface them as a vector IC.

src/type-feedback-vector.h

Index: src/type-feedback-vector.h
diff --git a/src/type-feedback-vector.h b/src/type-feedback-vector.h
index 05dfff7dba302b9b54279bf931f3f2ab60ba889b..7fb4cf326cbc741982fca2fc65e602322aeb13b5 100644
--- a/src/type-feedback-vector.h
+++ b/src/type-feedback-vector.h
@@ -23,6 +23,7 @@ enum class FeedbackVectorSlotKind {
   INVALID,
 
   CALL_IC,
+  CONSTRUCT_IC,
   LOAD_IC,
   KEYED_LOAD_IC,
   STORE_IC,
@@ -47,6 +48,10 @@ class FeedbackVectorSpecBase {
     return AddSlot(FeedbackVectorSlotKind::CALL_IC);
   }
 
+  FeedbackVectorSlot AddConstructICSlot() {
+    return AddSlot(FeedbackVectorSlotKind::CONSTRUCT_IC);
+  }
+
   FeedbackVectorSlot AddLoadICSlot() {
     return AddSlot(FeedbackVectorSlotKind::LOAD_IC);
   }
@@ -155,7 +160,7 @@ class TypeFeedbackMetadata : public FixedArray {
   static const char* Kind2String(FeedbackVectorSlotKind kind);
 
  private:
-  static const int kFeedbackVectorSlotKindBits = 3;
+  static const int kFeedbackVectorSlotKindBits = 4;
   STATIC_ASSERT(static_cast<int>(FeedbackVectorSlotKind::KINDS_NUMBER) <
                 (1 << kFeedbackVectorSlotKindBits));
 
@@ -399,7 +404,7 @@ class FeedbackNexus {
 };
 
 
-class CallICNexus final : public FeedbackNexus {
+class CallICNexus : public FeedbackNexus {
  public:
   // Monomorphic call ics store call counts. Platform code needs to increment
   // the count appropriately (ie, by 2).
@@ -407,11 +412,13 @@ class CallICNexus final : public FeedbackNexus {
 
   CallICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
       : FeedbackNexus(vector, slot) {
-    DCHECK_EQ(FeedbackVectorSlotKind::CALL_IC, vector->GetKind(slot));
+    DCHECK(vector->GetKind(slot) == FeedbackVectorSlotKind::CALL_IC ||
+           vector->GetKind(slot) == FeedbackVectorSlotKind::CONSTRUCT_IC);
   }
   CallICNexus(TypeFeedbackVector* vector, FeedbackVectorSlot slot)
       : FeedbackNexus(vector, slot) {
-    DCHECK_EQ(FeedbackVectorSlotKind::CALL_IC, vector->GetKind(slot));
+    DCHECK(vector->GetKind(slot) == FeedbackVectorSlotKind::CALL_IC ||
+           vector->GetKind(slot) == FeedbackVectorSlotKind::CONSTRUCT_IC);
   }
 
   void Clear(Code* host);
@@ -434,10 +441,22 @@ class CallICNexus final : public FeedbackNexus {
     return length == 0;
   }
 
+  Handle<Object> GetCallFeedback();
   int ExtractCallCount();
 };
 
 
+class ConstructICNexus final : public CallICNexus {
+ public:
+  ConstructICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
+      : CallICNexus(vector, slot) {}
+  ConstructICNexus(TypeFeedbackVector* vector, FeedbackVectorSlot slot)
+      : CallICNexus(vector, slot) {}
+
+  void Clear(Code* host);
+};
+
+
 class LoadICNexus : public FeedbackNexus {
  public:
   LoadICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)