forward list patch

[François Dumont <francois dot cppdevs at free dot fr>]

Hi

    While working on debug mode contention issue I discovered some bugs 
that I prefer to submit first. Here is a first patch for the 
forward_list. It fixes the move constructor that was missing the move of 
safe iterators and introduce a special _M_swap implementation that do 
not swap the before begin iterator that cannot move from a forward_list 
instance to an other.

Regards

Attachment: ChangeLog.entry
Description: Text document

Attachment: forward_list.patch
Description: Text document