- write_aiger;
- write_blif;
- write_btor;
- write_edif;
- write_firrtl;
- write_ilang.

Revert "Fix tests in backends,regression for new Yosys revision; Add new tests to frontends,misc,regression;"

This reverts commit e9fb66a3.

Fix tests in backends,regression for new Yosys revision; Add new tests to frontends,misc,regression;

5. clk2fflogic (104 - 144,180-195 are not covered)
9. memory_nordff(75-101 is not covered)
10. memory_unpack(91-108 is not covered)
12. hierarchy (the coverage from 44% increased to 61,3%)