* emacs-lisp/byte-opt.el (toplevel): Add compare-window-configurations,

* emacs-lisp/byte-opt.el (toplevel): Add compare-window-configurations,
frame-first-window, frame-root-window, frame-selected-window,
minibuffer-selected-window, minibuffer-window,
window-absolute-pixel-edges, window-at, window-body-height,
window-body-width, window-display-table, window-combination-limit,
window-frame, window-fringes, window-inside-absolute-pixel-edges,
window-inside-edges, window-inside-pixel-edges, window-left-child,
window-left-column, window-margins, window-next-buffers,
window-next-sibling, window-new-normal, window-new-total,
window-normal-size, window-parameter, window-parameters, window-parent,
window-pixel-edges, window-point, window-prev-buffers,
window-prev-sibling, window-redisplay-end-trigger, window-scroll-bars,
window-start, window-text-height, window-top-child, window-top-line,
window-total-height, window-total-width and window-use-time to the list
of functions without side-effects.
(toplevel): Add window-valid-p to the list of error-free functions
without side-effects.