[patch] Add const to constexpr member functions

[Jonathan Wakely]

On 15/04/14 19:29 +0100, Jonathan Wakely wrote:
>Add const to functions that would change meaning in C++14.
>
>Tested x86_64-linux, committed to trunk.

Also committed to the 4.9 branch

>    	* include/bits/atomic_base.h (__atomic_base<_PTp*>::_M_type_size): Add
>    	const to constexpr member functions.