master updated (5fb8b20 -> 52a55e1)

[Mattias Engdegård]

mattiase pushed a change to branch master.

      from  5fb8b20   mh-junk: replace color-based terms with descriptive words
       new  566e29f   Single source optimiser entry point
       new  9a63338   Elide lexical variables in for-effect context in source 
optimiser
       new  dc9e2a1   Optimise prog1 better
       new  ab9c064   Move warnings about bad let-bindings from source 
optimiser to cconv
       new  52a55e1   Optimise let and let* whose body is constant or the last 
variable


Summary of changes:
 lisp/emacs-lisp/byte-opt.el            | 99 +++++++++++++++++++++-------------
 lisp/emacs-lisp/bytecomp.el            |  6 +--
 lisp/emacs-lisp/cconv.el               |  7 +++
 test/lisp/emacs-lisp/bytecomp-tests.el | 18 +++++++
 4 files changed, 89 insertions(+), 41 deletions(-)