Merged revisions 76575 via svnmerge from

Merged revisions 76575 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r76575 | mark.dickinson | 2009-11-28 16:32:27 +0000 (Sat, 28 Nov 2009) | 5 lines

  Issue #1678380: When distinguishing between -0.0 and 0.0 in
  compiler_add_o, use copysign instead of examining the first and last
  bytes of the double.  The latter method fails for little-endian
  ARM, OABI, where doubles are little-endian but with the words swapped.
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