[Bug target/47769] [missed optimization] use of btr (bit test and reset)

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47769
Bug 47769 depends on bug 105735, which changed state.

Bug 105735 Summary: GCC failed to reduce &= loop_inv in loop.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105735

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE