Reland of [interpreter] Add string type feedback to add

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 055f22ea4741a93d2b59e537bb6dba064fa4ee6c..f70f01888f7bec01d3803d4fd3450ff7d5ef2e8d 100644
--- a/src/type-feedback-vector-inl.h
+++ b/src/type-feedback-vector-inl.h
@@ -129,6 +129,8 @@ BinaryOperationHint BinaryOperationHintFromFeedback(int type_feedback) {
       return BinaryOperationHint::kSignedSmall;
     case BinaryOperationFeedback::kNumber:
       return BinaryOperationHint::kNumberOrOddball;
+    case BinaryOperationFeedback::kString:
+      return BinaryOperationHint::kString;
     case BinaryOperationFeedback::kAny:
     default:
       return BinaryOperationHint::kAny;