master updated (5d7b1d5 -> 958f591)

[Glenn Morris]

gm pushed a change to branch master.

      from  5d7b1d5   Make overlays-in treat zero-length overlays at point-max 
consistently
      adds  b3aec9e   CC Mode: Fix unstable fontification of doc strings.
      adds  9664ee1   C++ Mode: Don't confuse the pointer operator -> with the 
type indicating ->
       new  958f591   Merge from origin/emacs-27


Summary of changes:
 lisp/progmodes/cc-engine.el |  2 +-
 lisp/progmodes/cc-fonts.el  | 15 +++++++++------
 2 files changed, 10 insertions(+), 7 deletions(-)