[turbofan] Also count megamorphic ICs as ICs with feedback.

src/type-feedback-vector-inl.h

Index: src/type-feedback-vector-inl.h
diff --git a/src/type-feedback-vector-inl.h b/src/type-feedback-vector-inl.h
index 43f055b7bd6f8af19a4b67e6fc9bc1eabb856b62..4b363ecf38ea55f48c1163db0036caf066ee9347 100644
--- a/src/type-feedback-vector-inl.h
+++ b/src/type-feedback-vector-inl.h
@@ -185,6 +185,7 @@ void TypeFeedbackVector::ComputeCounts(int* with_type_info, int* generic,
           with++;
         } else if (obj == megamorphic_sentinel) {
           gen++;
+          if (code_is_interpreted) with++;
         }
         total++;
         break;