Refix issue 1472. The previous fix worked for the example in the bug

src/isolate.h

Index: src/isolate.h
===================================================================
--- src/isolate.h	(revision 8301)
+++ src/isolate.h	(working copy)
@@ -890,7 +890,12 @@
   }
 
   RegExpStack* regexp_stack() { return regexp_stack_; }
+  int regexp_expansion_factor() { return regexp_expansion_factor_; }
+  void set_regexp_expansion_factor(int value) {
+    regexp_expansion_factor_ = value;
+  }
 
+
   unibrow::Mapping<unibrow::Ecma262Canonicalize>*
       interp_canonicalize_mapping() {
     return &interp_canonicalize_mapping_;
@@ -1150,6 +1155,7 @@
   unibrow::Mapping<unibrow::Ecma262Canonicalize>
       regexp_macro_assembler_canonicalize_;
   RegExpStack* regexp_stack_;
+  int regexp_expansion_factor_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
   void* embedder_data_;