[Bug c++/65656] __builtin_constant_p should always be constexpr

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65656

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Target Milestone|5.4                         |5.5

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 5.4 is being released, adjusting target milestone.