Correctly eliminate duplicate cases in switch compilation
Fix code mistakes that prevented the correct elimination of duplicated cases when compiling a `cond' form to a switch bytecode, as in (cond ((eq x 'a) 1) ((eq x 'b) 2) ((eq x 'a) 3) ; should be elided ((eq x 'c) 4)) Sometimes, this caused the bytecode to use the wrong branch (bug#35770). * lisp/emacs-lisp/bytecomp.el (byte-compile-cond-vars): Return obj2 eval'ed. (byte-compile-cond-jump-table-info): Discard redundant condition. Use `obj2' as evaluated. Discard duplicated cases instead of failing the table generation. * test/lisp/emacs-lisp/bytecomp-tests.el (toplevel): Require subr-x. (byte-opt-testsuite-arith-data, bytecomp-test--switch-duplicates): Test.
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