[Bug tree-optimization/121730] [13/14/15/16 regression] wrong code at -O1 on x86_64-linux-gnu (generated code hangs) since r11-6188-g0b76990a9d75d9

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121730
Bug 121730 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