Improve SeqString::Truncate for latest allocated strings.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 933a07599a455f6a19774a84b198b41e3aefdd13..e5ec80a301cdf30adf54c89048eafb9f82ee1e2b 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7754,7 +7754,7 @@ class SeqString: public String {
   // Truncate the string in-place if possible and return the result.
   // In case of new_length == 0, the empty string is returned without
   // truncating the original string.

[Hannes Payer (out of office), 2013/03/21 12:48:30]

I would revert this change and truncate all strings >= length 0 and return in
the new_length==0 case the empty string.

-  MUST_USE_RESULT String* Truncate(int new_length);
+  void Truncate(int new_length);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SeqString);