[PATCH] D21329: Rename and rework `_LIBCPP_TRIVIAL_PAIR_COPY_CTOR`. Move FreeBSD configuration in-tree.

[Dimitry Andric via cfe-commits]

dim added a comment.

In http://reviews.llvm.org/D21329#475105, @theraven wrote:

> Looks fine to me, though I wonder if we want to move to the new ABI for FreeBSD11 and use the old one for <=10.


For 11 it is certainly too late now, since it is ABI/API frozen now, and we would still need to find some way of providing backwards compat for applications that were linked against the earlier libc++, which still had the non-trivial pair copy constructor.


http://reviews.llvm.org/D21329