[Bug tree-optimization/21520] missing PRE opportunity with cast after cast

[pinskia at gcc dot gnu dot org]

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           What    |Removed                     |Added
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                 CC|                            |dberlin at gcc dot gnu dot
                   |                            |org, pinskia at gcc dot gnu
                   |                            |dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21520