c++0x tests fixes

[François Dumont]

Hi

     This is some feedback on tests run in C++0x mode with or without 
debug mode.

     First failures without debug mode:

23_containers/vector/cons/4.cc
23_containers/deque/cons/2.cc

     The code was calling vector and deque constructor taking a size. 
Before C++0x it meant contruct N instances as the copy of a default 
constructed instance. In C++0x it means contruct N default constructed 
instance. I change the code to make copy constructor invocation explicit.

23_containers/deque/requirements/explicit_instantiation/2.cc
23_containers/list/requirements/explicit_instantiation/2.cc
23_containers/vector/requirements/explicit_instantiation/2.cc

     The problem is simply that in C++0x mode deque/list/vector 
containers cannot be explicitely instanciated with non default 
constructible types. Is it a known fact ? If so I think I will introduce 
a dg-require-no-experimental-mode to ignore those tests in this mode.

Now 2 debug specific failures:

23_containers/deque/types/1.cc
23_containers/vector/types/1.cc

     There is an ambiguity because of an internal iterator check using 
operator -(). Both operator-() from the test file itself and the one for 
move_iterator could be used. IMO this is again the problem of current 
algo design regarding debug mode, the same function is a debug version 
or not depending on _GLIBCXX_DEBUG macro rather than having 2 versions 
of the function in difference namespace. With this split normal 
containers hidden behind debug ones could use normal algos. This is a 
big modif for libstdc++ so for the moment I only bypass debug check by 
replacing usage of std::copy in __uninit_copy by a direct use of 
__copy_move_a2. Normally when calling internal __uninit_copy function 
debug checks must already have been performed so there is no debug more 
regression.

François
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