Revert "Merge remote-tracking branch 'origin/eddie/shregmap_improve' into xc7mux"
Revert "Merge remote-tracking branch 'origin/eddie/shregmap_improve' into xc7mux"

This reverts commit 5174082208ef9bea22ad1ba62622947375b3e83b, reversing
changes made to 54379f9872ba3abdf5328994abcf5abfc7288c6b.

SymbiFlow/yosys,SymbiFlow/yosys,SymbiFlow/yosys,YosysHQ/yosys,antmicro/yosys,YosysHQ/yosys,antmicro/yosys,antmicro/yosys,cliffordwolf/yosys,cliffordwolf/yosys,SymbiFlow/yosys,cliffordwolf/yosys,cliffordwolf/yosys,SymbiFlow/yosys,SymbiFlow/yosys,antmicro/yosys,cliffordwolf/yosys,YosysHQ/yosys,antmicro/yosys,YosysHQ/yosys,antmicro/yosys,SymbiFlow/yosys,cliffordwolf/yosys,YosysHQ/yosys,cliffordwolf/yosys,cliffordwolf/yosys,cliffordwolf/yosys,YosysHQ/yosys,SymbiFlow/yosys,antmicro/yosys,YosysHQ/yosys,YosysHQ/yosys,antmicro/yosys