[Bug tree-optimization/73550] Another wrong -Wmaybe-uninitialized warning in switch statement

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=73550

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
The diagnostic is gone in GCC 12+ and re-appears with adding -fno-thread-jumps
because:

MAX_NUM_CHAINS exceeded: 8

and the logic is extra stupid in building 8 chains but no more but then
when building predicates rejecting exactly the case of 8 chains ...