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(GCTYPEBITS): Default now 3.

(enum Lisp_Type): Lisp_Process, Lisp_Window, Lisp_Frame, Lisp_Subr deleted.
(PSEUDOVECTORP, GC_PSEUDOVECTORP):  Add paren for proper nesting.
(PROCESSP, GC_PROCESSP, XSETPROCESS): Rewrite to use pseudovectors.
(WINDOWP, GC_WINDOWP, XSETWINDOW): Likewise.
(FRAMEP, GC_FRAMEP): Likewise.
(SUBRP, GC_SUBRP, XSETSUBR): Likewise.
(PVEC_SUBR): New macro.
(struct Lisp_Subr): Add a size field.
(DEFUN (both definitions)): Store that size field.