[Bug tree-optimization/92765] [10 Regression] Wrong code caused by folding of -Wstring-compare since r276773

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92765

--- Comment #16 from Martin Sebor <msebor at gcc dot gnu.org> ---
The warning doesn't affect code generation.  It's issued independent of it. 
We'll have to agree to disagree about the validity of the test case in comment
#0, but I do agree that at least some of your test cases unfortunately are
valid in C (although I don't think they're also valid in C++ where only the
union member that was last written to can be read).  I'll look into this when
I'm back from PTO in January.