[ic] Properly initialize dummy feedback vector.

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 509db99c35dd99b55e10f9c9bf9b6f263bcdd1b0..af69499b044ceaacb0659dc595ed8a958cc0e575 100644
--- a/src/type-feedback-vector.h
+++ b/src/type-feedback-vector.h
@@ -566,6 +566,10 @@ class KeyedLoadICNexus : public FeedbackNexus {
       : FeedbackNexus(vector, slot) {
     DCHECK_EQ(FeedbackVectorSlotKind::KEYED_LOAD_IC, vector->GetKind(slot));
   }
+  explicit KeyedLoadICNexus(Isolate* isolate)
+      : FeedbackNexus(
+            TypeFeedbackVector::DummyVector(isolate),
+            FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedLoadICSlot)) {}
   KeyedLoadICNexus(TypeFeedbackVector* vector, FeedbackVectorSlot slot)
       : FeedbackNexus(vector, slot) {
     DCHECK_EQ(FeedbackVectorSlotKind::KEYED_LOAD_IC, vector->GetKind(slot));