* window.h (struct window): Change window_end_valid member from

* window.h (struct window): Change window_end_valid member from
Lisp_Object to a bitfield.  Adjust comments.
(wset_window_end_valid): Remove.
* window.c (adjust_window_count): Clear window_end_valid.
(Fwindow_end): Adjust user.  Remove ancient #if 0 code.
(Fwindow_line_height, set_window_buffer, Frecenter)
(Fsplit_window_internal, Fdelete_other_windows_internal)
(Fset_window_fringes, Fset_window_scroll_bars): Adjust users.
* dispnew.c (adjust_glyph_matrix, clear_window_matrices): Likewise.
* xdisp.c (check_window_end, reconsider_clip_changes)
(redisplay_internal, mark_window_display_accurate_1, redisplay_window)
(try_window, try_window_reusing_current_matrix, note_mouse_highlight)
(find_first_unchanged_at_end_row, try_window_id): Likewise.