Apply new meta-programming traits throughout the library.

The new meta-programming primitives are lower cost than the old versions. This patch removes those old versions and switches libc++ to use the new ones.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@364160 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed