Reinstate libc++ patches now that the lldb formatter has been updated.

"[libc++] Fix <atomic> failures on GCC"
"[libc++] Change memory_order to an enum class"
"[libc++] decoupling Freestanding atomic<T> from libatomic.a"

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@355427 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed