[Bug middle-end/21180] [4.1 Regression] checking on fold is no longer happen in some cases

[pinskia at gcc dot gnu dot org]

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           What    |Removed                     |Added
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                 CC|                            |kazu at cs dot umass dot edu
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21180