Share ebo helper throughout lib

[Marc Glisse]

On Wed, 25 Jul 2018, François Dumont wrote:

> Â Â Â  It has already been noticed that there are 2 ebo helpers in the lib. Here 
> is a patch to use 1.
>
>
> Â Â Â  * include/bits/ebo_helper.h: New.
> Â Â Â  * include/Makefile.am: Add latter.
> Â Â Â  * include/Makefile.in: Regenerate.
> Â Â Â  * include/bits/hashtable_policy.h: Adapt.
> Â Â Â  * include/bits/shared_ptr_base.h: Adapt.
>
> Tested under linux x86_64.
>
> Ok to commit ?

I don't think we support [[no_unique_address]] yet, but assuming we soon 
will and we enable it also for C++03 (at least with the __attribute__ 
syntax and/or in system headers), do you know if some similar helper will 
still be necessary, with a simpler implementation, or if the attribute 
will magically get rid of it?

(I haven't looked at it at all, the answer may be obvious)

-- 
Marc Glisse