BTW, font-lock-comment-delimiter-face as well as font-lock-negation-char-face
are very new faces, so it's better to remove the -face suffix from them now
than to create aliases for backward compatibility later after the release.
Maybe, but currently all the faces defined by font-lock have
names ending in -face.
Perhaps we should change them all now, since so many other faces
have been renamed. If so, I think it would be good to add
parallel aliases even for the faces that are new, just so that
all the faces have them in the same way.