Merge from origin/emacs-26

bd1d617 Avoid race in rcirc process filter (bug#33145)
88ef31a Avoid file-name errors when viewing PDF from Gnus
c939042 Avoid crashes with remapped default face in Org mode
97660fa Doc fix for checkdoc-continue
96f055b Fix a typo in autoload.el

diff --cc lisp/doc-view.el
Simple merge

diff --cc lisp/emacs-lisp/autoload.el
Simple merge

diff --cc lisp/emacs-lisp/checkdoc.el
Simple merge

diff --cc lisp/net/rcirc.el
Simple merge

diff --cc src/xfaces.c
Simple merge