[Bug tree-optimization/57359] store motion causes wrong code for union access at -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359
Bug 57359 depends on bug 95172, which changed state.

Bug 95172 Summary: [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172

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