read_aiger: Interpret new extension with cell mapping #4570
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What are the reasons/motivation for this change?
A stepping stone to be able to use abc9 for ASIC flows
Explain how this is achieved.
We read a new 'M' extension with cell mapping that's part of the output AIGER file written by abc (complementary PR on the abc side: berkeley-abc/abc#327)
If applicable, please suggest to reviewers how they can test the change.