[patch] No allocation for empty unordered containers

[Jonathan Wakely]

On 14/08/14 21:22 +0200, François Dumont wrote:
>    Then here is the patch to introduce default constructor with 
>compiler computed noexcept qualification. Note that I also made 
>allocator aware default constructor allocation free however noexcept 
>qualification has to be manually written which I find quite a burden. 
>Do you think we shall do so now ?

I don't really care about that constructor, no need to do it now.

The patch is OK to commit, thanks.