[type-profile] Handle returns correctly.

src/feedback-vector.cc

Index: src/feedback-vector.cc
diff --git a/src/feedback-vector.cc b/src/feedback-vector.cc
index 9b07ba016faaff69960276bc02890f362293ec1c..e175044beb93ea0cc9c119d17556a00652678967 100644
--- a/src/feedback-vector.cc
+++ b/src/feedback-vector.cc
@@ -177,6 +177,17 @@ FeedbackSlotKind FeedbackVector::GetKind(FeedbackSlot slot) const {
   return metadata()->GetKind(slot);
 }
 
+FeedbackSlot FeedbackVector::GetTypeProfileSlot() const {
+  FeedbackMetadataIterator iter(metadata());
+  while (iter.HasNext()) {
+    FeedbackSlot slot = iter.Next();
+    if (IsTypeProfile(slot)) {
+      return slot;
+    }
+  }
+  return FeedbackSlot();
+}
+
 // static
 Handle<FeedbackVector> FeedbackVector::New(Isolate* isolate,
                                            Handle<SharedFunctionInfo> shared) {