akr	2007-08-19 13:34:44 +0900 (Sun, 19 Aug 2007)

  New Revision: 13113

  Modified files:
    trunk/ChangeLog
    trunk/gc.c

  Log:
    * gc.c: use VALGRIND_MAKE_MEM_UNDEFINED to detect use of collected
      objects if valgrind is available.  It cannot detect first 2 words 
      because they are used as the free list.


  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/ChangeLog?r1=13113&r2=13112
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/gc.c?r1=13113&r2=13112