[Bug optimization/14846] [tree-ssa] don't use a shift in A & CST_POWER_OF_2 == 0 until very late in tree-ssa optimizations

[pinskia at gcc dot gnu dot org]

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OtherBugsDependingO|14847                       |
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14846