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[Bug middle-end/19987] [meta-bug] fold missing optimizations in general


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19987
Bug 19987 depends on bug 15350, which changed state.

Bug 15350 Summary: [tree-ssa] Convert if ((1 << a) & 1) into if (a == 0).
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15350

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED


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