Implement http://wg21.link/p0302r1: Removing Allocator Support in std::function. These functions never worked, and as far as I know, no one ever called them.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@284164 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed