Marcelina Kościelnicka eb76d35e80 memory_dff: Fix needlessly duplicating enable bits. ...

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.

2020-10-22 13:03:42 +02:00

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