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* memory_dff: Fix needlessly duplicating enable bits.Marcelina Koƛcielnicka2020-10-221-0/+24
When the register being merged into the EN signal happens to be a $sdff, the current code creates a new $mux for every bit, even if they happen to be identical (as is usually the case), preventing proper grouping further down the flow. Fix this by adding a simple cache. Fixes #2409.