[Bug tree-optimization/106155] [12/13 Regression] spurious "may be used uninitialized" warning

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106155

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
This is another example where when doing PHI chaining, we fail to consider the
use predicate of the PHI operand in the final PHI which has now no further
guard before the use.