* lisp/emacs-lisp/pcase.el: Use pcase-defmacro to handle backquote.
(pcase--upat): Remove. (pcase--macroexpand): Don't hardcode handling of `. (pcase--split-consp, pcase--split-vector): Remove. (pcase--split-equal): Disregard ` since it's expanded away. (pcase--split-member): Optimize for quote rather than for `. (pcase--split-pred): Optimize for quote rather than for `. (pcase--u1): Remove handling of ` (and of `or' and `and'). Quote non-selfquoting values when passing them to `eq'. Drop `app's let-binding if the variable is not used. (pcase--q1): Remove. (`): Define as a pattern macro.
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