bytecmp: tagbody: ensure ECL_NIL->ECL_NIL_SYMBOL conversion
Issue comes from the fact that list and symbol types are not disjoint. Fixes #475. My personal opinion (to put some rambling in a commit message) is that having NIL being so many things is a blatant mistake and shouldn't be picked up for Common Lisp (though many programs would probably break and it wouldn't be so Common then).
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