[PATCH] __debug::list use C++11 direct initialization

[François Dumont]

Here is the communication for my yesterday's patch which I thought svn 
had failed to commit (I had to interrupt it).

Similarly to what I've done for associative containers here is a cleanup 
of the std::__debug::list implementation leveraging more on C++11 direct 
initialization.

I also made sure we use consistent comparison between 
iterator/const_iterator in erase and emplace methods.

2018-10-08  François Dumont <fdumont@gcc.gnu.org>

 Â Â Â  * include/debug/list (list<>::cbegin()): Use C++11 direct
 Â Â Â  initialization.
 Â Â Â  (list<>::cend()): Likewise.
 Â Â Â  (list<>::emplace<>(const_iterator, _Args&&...)): Likewise.
 Â Â Â  (list<>::insert(const_iterator, initializer_list<>)): Likewise.
 Â Â Â  (list<>::insert(const_iterator, size_type, const _Tp&)): Likewise.
 Â Â Â  (list<>::erase(const_iterator, const_iterator)): Ensure consistent
 Â Â Â  iterator comparisons.
 Â Â Â  (list<>::splice(const_iterator, list&&, const_iterator,
 Â Â Â  const_iterator)): Likewise.

Tested under Linux x86_64 Debug mode and committed.

François

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