[Bug rtl-optimization/121648] [13/14/15/16 Regression] wrong code at -O{s, 2, 3} with "-fno-tree-loop-im -fno-gcse -fno-code-hoisting -fno-tree-fre -fno-tree-pre -fno-tree-dominator-opts" on x86_64-linux-gnu since r11-6188-g0b76990a9d75d9

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121648
Bug 121648 depends on bug 40209, which changed state.

Bug 40209 Summary: stale REG_UNUSED note vs single_set
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40209

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