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Avoid creating equalities over the postponed bitvector when the object
literals trivially aren't equal, and directly encode bitwise equality
when the object literals are trivially equal (and stop searching for a
matching object). In all other cases, avoid unnecessary Tseitin
variables to encode the postponed bitvector equality.
When running on various proofs done for AWS open-source projects, this
changes the performance as follows (when comparing to diffblue#7021): with
CaDiCaL as back-end, the total solver time for the hardest 46 proofs
changes from 26779.7 to 22409.9 seconds (4369.8 seconds speed-up); with
Minisat, however, the hardest 49 proofs take 28616.7 instead of 28420.4
seconds (196.3 seconds slow-down). Across these benchmarks, 11.7% of
variables and 12.8% of clauses are removed.
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