Add removing of redundant pairs of bits in ==, ===, !=, and !== to opt_expr
Add removing of redundant pairs of bits in ==, ===, !=, and !== to opt_expr

YosysHQ/yosys,SymbiFlow/yosys,YosysHQ/yosys,SymbiFlow/yosys,SymbiFlow/yosys,cliffordwolf/yosys,azonenberg/yosys,YosysHQ/yosys,antmicro/yosys,azonenberg/yosys,SymbiFlow/yosys,cliffordwolf/yosys,YosysHQ/yosys,antmicro/yosys,antmicro/yosys,azonenberg/yosys,swallat/yosys,swallat/yosys,cliffordwolf/yosys,YosysHQ/yosys,antmicro/yosys,YosysHQ/yosys,cliffordwolf/yosys,azonenberg/yosys,swallat/yosys,YosysHQ/yosys,azonenberg/yosys,swallat/yosys,SymbiFlow/yosys,SymbiFlow/yosys,swallat/yosys,swallat/yosys,azonenberg/yosys,SymbiFlow/yosys,azonenberg/yosys,YosysHQ/yosys,antmicro/yosys,swallat/yosys,azonenberg/yosys,antmicro/yosys,cliffordwolf/yosys,antmicro/yosys,cliffordwolf/yosys,cliffordwolf/yosys,SymbiFlow/yosys,cliffordwolf/yosys,swallat/yosys,cliffordwolf/yosys,swallat/yosys,azonenberg/yosys,antmicro/yosys