Fix debbugs#16971
* lisp/emacs-lisp/lisp-mode.el (lisp-mode-variables): Set `comment-use-syntax' to t to avoid the unnecessary runtime check. Set `comment-start-skip' to a simpler value that doesn't try to check if the semicolon is escaped (this is handled by `syntax-ppss' now). * lisp/progmodes/scheme.el (scheme-mode-variables): Same.
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