* emacs-lisp/lisp.el (beginning-of-defun, end-of-defun):

* emacs-lisp/lisp.el (beginning-of-defun, end-of-defun):
Do not push mark when mark is active in transient-mark-mode.
* emacs-lisp/lisp.el (mark-sexp, mark-defun):
Extend the region when mark is active in transient-mark-mode,
regardless of the last command.  Doc fix.
* emacs-lisp/lisp.el (mark-sexp): Reverse the condition for
preserving direction, to mark forward instead of backward when mark
is equal to point (e.g. when C-SPC C-M-SPC is typed in t-m-m).