(Lisp_Misc): new type code, replacing Lisp_Marker (and soon to replace other
type codes as well). (XMARKER, SETMARKER, MARKERP): Check/set the new type field. (XMISC, SETMISC, MISCP): New accessor macros for the superset type. (struct Lisp_Free): New structure. (Lisp_Misc_Free): Type code for that structure.
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