1 files changed, 12 insertions, 1 deletions
diff --git a/deps/v8/src/feedback-vector-inl.h b/deps/v8/src/feedback-vector-inl.h
index 54d287a3b7..e14381f2ab 100644
--- a/deps/v8/src/feedback-vector-inl.h
+++ b/deps/v8/src/feedback-vector-inl.h
@@ -31,7 +31,7 @@ bool FeedbackMetadata::is_empty() const {
 
 int FeedbackMetadata::slot_count() const {
   if (length() == 0) return 0;
-  DCHECK(length() > kReservedIndexCount);
+  DCHECK_GT(length(), kReservedIndexCount);
   return Smi::ToInt(get(kSlotsCountIndex));
 }
 
@@ -44,6 +44,7 @@ FeedbackVector* FeedbackVector::cast(Object* obj) {
 int FeedbackMetadata::GetSlotSize(FeedbackSlotKind kind) {
   switch (kind) {
     case FeedbackSlotKind::kForIn:
+    case FeedbackSlotKind::kInstanceOf:
     case FeedbackSlotKind::kCompareOp:
     case FeedbackSlotKind::kBinaryOp:
     case FeedbackSlotKind::kLiteral:
@@ -293,6 +294,16 @@ void FeedbackVector::ComputeCounts(int* with_type_info, int* generic,
         total++;
         break;
       }
+      case FeedbackSlotKind::kInstanceOf: {
+        if (obj->IsWeakCell()) {
+          with++;
+        } else if (obj == megamorphic_sentinel) {
+          gen++;
+          with++;
+        }
+        total++;
+        break;
+      }
       case FeedbackSlotKind::kCreateClosure:
       case FeedbackSlotKind::kLiteral:
         break;