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The typeq special operator is the main remaining messy point we have to worry about in the compiler. It works poorly with the bytecode, adds a complication to code walking, yada yada yada.
This PR leaves (most) things as typep calls but puts in optimizations clasp-cleavir can use to replace those calls with header checks &c. like we have. It also improves clasp-cleavir type inference a bit with information about predicate functions like
consp
.