[InstCombine] fold icmp equality with sdiv and SMIN

This extends the fold from D126410 / 3952c905
to allow for the only case where it works with signed
division:
https://alive2.llvm.org/ce/z/k7_ypu

(X s/ Y) == SMIN --> (X == SMIN) && (Y == 1)
(X s/ Y) != SMIN --> (X != SMIN) || (Y != 1)

This is another improvement based on #55695.