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(MARKBIT): Don't define if already defined.
(VALMASK, GCTYPEMASK, XSETTYPE, XSET)
(XSETCONS, XSETBUFFER, XSETVECTOR, XSETSUBR, XSETSTRING)
(XSETSYMBOL, XSETFUNCTION, XSETMARKER, XSETOBJFWD)
(XSETINTPTR, XSETWINDOW, XSETPROCESS, XSETFLOAT)
(struct Lisp_String, struct Lisp_Vector): Use EMACS_INT.