[mlir][llvm] Implement ConstantLike for ZeroOp, UndefOp, PoisonOp (#93690)

These act as constants and should be propagated whenever possible. It is
safe to do so for mlir.undef and mlir.poison because they remain "dirty"
through out their lifetime and can be duplicated, merged, etc. per the
LangRef.

Signed-off-by: Guy David <guy.david@nextsilicon.com>