DO NOT MERGE Do not require signed zero support in ldexp tests() am: 5b076d99a8  -s ours am: 366da5103d
am: 6a4a901e5a  -s ours

* commit '6a4a901e5a338db4ae668de61128667d617b373b':
  DO NOT MERGE Do not require signed zero support in ldexp tests()