[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 90668, which changed state.

Bug 90668 Summary: loop invariant moving a dependent store out of a loop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90668

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