drop interalization of strings entering global constant slots

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 9556ec92be452dc05407a32d8d3fc9755ca7b339..a574980c1fe2ccad20ebff3ac42bb83e4929d45e 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -142,7 +142,7 @@ class LookupIterator final BASE_EMBEDDED {
   Handle<Object> GetDataValue() const;
   // Usually returns the value that was passed in, but may perform
   // non-observable modifications on it, such as internalize strings.
-  Handle<Object> WriteDataValue(Handle<Object> value);
+  void WriteDataValue(Handle<Object> value);
   void InternalizeName();
 
  private: