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(CHECK_NATNUM): Use that macro instead of its expansion.

(enum Lisp_Type): Delete the corresponding enumeration from here.
(struct Lisp_Overlay): New structure.
(XOVERLAY, OVERLAYP): Access the new structure.
(union Lisp_Misc): Add new member.

Lisp_Misc_Some_Buffer_Local_Value.
(enum Lisp_Type): Delete the corresponding enumerations from here.
(struct Lisp_Buffer_Local_Value): New structure.
(XBUFFER_LOCAL_VALUE): Access the new structure.
(BUFFER_LOCAL_VALUEP, BUFFER_SOME_LOCAL_VALUEP): Likewise.
(union Lisp_Misc): Add new member.

(IS_DIRECTORY_SEP, IS_ANY_SEP): New macros, defined if not already def.

Lisp_Misc_Boolfwd, Lisp_Misc_Objfwd, Lisp_Misc_Buffer_Objfwd.
(enum Lisp_Type): Delete the corresponding enumerations from here.
(struct Lisp_Buffer_Objfwd): New structure.
(struct Lisp_Intfwd, struct Lisp_Boolfwd, struct Lisp_Objfwd): Ditto.
(XINTFWD, XBOOLFWD, XOBJFWD, XBUFFER_OBJFWD): Access the new structure.
(INTFWDP, BOOLFWDP, OBJFWDP, BUFFER_OBJFWDP): Ditto.
(XSETINTFWD, XSETBOOLFWD, XSETOBJFWD, XSETBUFFER_OBJFWD): Deleted.
(union Lisp_Misc): Add new members.
(allocate_misc): Declare this function.
(XINTPTR): Deleted.

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.

(struct Lisp_Marker): Add a member of that type.  Delete unused member
`modified'.

XSETFASTINT instead.

(CHECK_NUMBER_COERCE_MARKER): Don't use XFASTINT as an lvalue.
(CHECK_NUMBER_OR_FLOAT_COERCE_MARKER): Likewise.

XSETMARKER, XSETOBJFWD, XSETWINDOW, XSETPROCESS, XSETFLOAT): Set object type
as well as value.
(XSETBOOLFWD, XSETBUFFER_OBJFWD, XSETWINDOW_CONFIGURATION,
XSETINTERNAL_STREAM, XSETINTFWD, XSETINTERNAL): New macros.
(XSETUINT, XSETPNTR, XFUNCTION, XSETFUNCTION, XSETINTPTR): Deleted.

SOME_BUFFER_LOCAL_VALUEP, BUFFER_OBJFWDP, VOIDP): New type test macros.
(CHECK_STRING_OR_BUFFER, NUMBERP, CHECK_LIST, CHECK_STRING, CHECK_CONS,
CHECK_SYMBOL, CHECK_VECTOR, CHECK_BUFFER, CHECK_WINDOW, CHECK_LIVE_WINDOW,
CHECK_PROCESS, CHECK_NUMBER, CHECK_NATNUM, CHECK_MARKER,
CHECK_NUMBER_COERCE_MARKER, CHECK_FLOAT, CHECK_NUMBER_OR_FLOAT,
CHECK_NUMBER_OR_FLOAT_COERCE_MARKER, CHECK_OVERLAY): Use type test macros.

(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.

(GCPRO5): New macro.

(CHECK_NATNUM): Use Qwholenump.

(FAST_MAKE_GLYPH, FAST_GLYPH_CHAR, FAST_GLYPH_FACE): New macros.