master updated (4b1ab18391 -> 8517d1e9aa)

[Mattias Engdegård]

mattiase pushed a change to branch master.

      from  4b1ab18391 Fix autoload in tramp.el
       new  869db699ee Improved static detection of nil and non-nil expressions
       new  e618b6faee Improved `if` and `while` optimisation
       new  621550c076 Improved `and` and `or` optimisation
       new  fb98c4a406 Improved `null` (alias `not`) optimisation
       new  8517d1e9aa * lisp/dired.el (dired-mark-if): Evaluate MSG once to 
avoid warning.


Summary of changes:
 lisp/dired.el               |  11 +-
 lisp/emacs-lisp/byte-opt.el | 303 +++++++++++++++++++++++++++++++-------------
 2 files changed, 223 insertions(+), 91 deletions(-)