Merged revisions 68587 via svnmerge from

Merged revisions 68587 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r68587 | antoine.pitrou | 2009-01-13 23:59:11 +0100 (mar., 13 janv. 2009) | 7 lines

  Issue #4935: The overflow checking code in the expandtabs() method common
  to str, bytes and bytearray could be optimized away by the compiler (*), letting
  the interpreter segfault instead of raising an error.

  (*) or at least it is our interpretation
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