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

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19987
Bug 19987 depends on bug 96688, which changed state.

Bug 96688 Summary: Failure to optimize shift-right/add+bitwise not of constant to avoid bitwise not
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96688

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