[ADT][NFC] Remove some redundant code

Some typetraits are defined twice, delete this part of the code.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D159331

llvm/include/llvm/ADT/STLExtras.h

@@ -1484,16 +1484,6 @@ struct on_first {
 template <int N> struct rank : rank<N - 1> {};
 template <> struct rank<0> {};
 
-/// traits class for checking whether type T is one of any of the given
-/// types in the variadic list.
-template <typename T, typename... Ts>
-using is_one_of = std::disjunction<std::is_same<T, Ts>...>;
-
-/// traits class for checking whether type T is a base class for all
-///  the given types in the variadic list.
-template <typename T, typename... Ts>
-using are_base_of = std::conjunction<std::is_base_of<T, Ts>...>;
-
 namespace detail {
 template <typename... Ts> struct Visitor;