diff --git a/compiler-rt/lib/orc/stl_extras.h b/compiler-rt/lib/orc/stl_extras.h
index e4f8bf0e96aa51..33c877b193c533 100644
--- a/compiler-rt/lib/orc/stl_extras.h
+++ b/compiler-rt/lib/orc/stl_extras.h
@@ -18,29 +18,6 @@
 
 namespace __orc_rt {
 
-namespace detail {
-
-template <typename F, typename Tuple, std::size_t... I>
-decltype(auto) apply_tuple_impl(F &&f, Tuple &&t, std::index_sequence<I...>) {
-  return std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...);
-}
-
-} // end namespace detail
-
-/// Given an input tuple (a1, a2, ..., an), pass the arguments of the
-/// tuple variadically to f as if by calling f(a1, a2, ..., an) and
-/// return the result.
-///
-/// FIXME: Switch to std::apply once we can use c++17.
-template <typename F, typename Tuple>
-decltype(auto) apply_tuple(F &&f, Tuple &&t) {
-  using Indices = std::make_index_sequence<
-      std::tuple_size<typename std::decay<Tuple>::type>::value>;
-
-  return detail::apply_tuple_impl(std::forward<F>(f), std::forward<Tuple>(t),
-                                  Indices{});
-}
-
 /// Substitute for std::identity.
 /// Switch to std::identity once we can use c++20.
 template <class Ty> struct identity {
diff --git a/compiler-rt/lib/orc/unittests/CMakeLists.txt b/compiler-rt/lib/orc/unittests/CMakeLists.txt
index d0acc49747f7ef..93eaace0adcc1e 100644
--- a/compiler-rt/lib/orc/unittests/CMakeLists.txt
+++ b/compiler-rt/lib/orc/unittests/CMakeLists.txt
@@ -84,7 +84,6 @@ set(UNITTEST_SOURCES
   executor_address_test.cpp
   extensible_rtti_test.cpp
   orc_unit_test_main.cpp
-  stl_extras_test.cpp
   wrapper_function_utils_test.cpp
   simple_packed_serialization_test.cpp
   )
diff --git a/compiler-rt/lib/orc/unittests/stl_extras_test.cpp b/compiler-rt/lib/orc/unittests/stl_extras_test.cpp
deleted file mode 100644
index 0a505c00dc01cd..00000000000000
--- a/compiler-rt/lib/orc/unittests/stl_extras_test.cpp
+++ /dev/null
@@ -1,65 +0,0 @@
-//===-- stl_extras_test.cpp ------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file is a part of the ORC runtime.
-//
-// Note:
-//   This unit test was adapted from tests in
-//   llvm/unittests/ADT/STLExtrasTest.cpp
-//
-//===----------------------------------------------------------------------===//
-
-#include "stl_extras.h"
-#include "gtest/gtest.h"
-
-using namespace __orc_rt;
-
-TEST(STLExtrasTest, ApplyTuple) {
-  auto T = std::make_tuple(1, 3, 7);
-  auto U = __orc_rt::apply_tuple(
-      [](int A, int B, int C) { return std::make_tuple(A - B, B - C, C - A); },
-      T);
-
-  EXPECT_EQ(-2, std::get<0>(U));
-  EXPECT_EQ(-4, std::get<1>(U));
-  EXPECT_EQ(6, std::get<2>(U));
-
-  auto V = __orc_rt::apply_tuple(
-      [](int A, int B, int C) {
-        return std::make_tuple(std::make_pair(A, char('A' + A)),
-                               std::make_pair(B, char('A' + B)),
-                               std::make_pair(C, char('A' + C)));
-      },
-      T);
-
-  EXPECT_EQ(std::make_pair(1, 'B'), std::get<0>(V));
-  EXPECT_EQ(std::make_pair(3, 'D'), std::get<1>(V));
-  EXPECT_EQ(std::make_pair(7, 'H'), std::get<2>(V));
-}
-
-class apply_variadic {
-  static int apply_one(int X) { return X + 1; }
-  static char apply_one(char C) { return C + 1; }
-  static std::string apply_one(std::string S) {
-    return S.substr(0, S.size() - 1);
-  }
-
-public:
-  template <typename... Ts> auto operator()(Ts &&... Items) {
-    return std::make_tuple(apply_one(Items)...);
-  }
-};
-
-TEST(STLExtrasTest, ApplyTupleVariadic) {
-  auto Items = std::make_tuple(1, std::string("Test"), 'X');
-  auto Values = __orc_rt::apply_tuple(apply_variadic(), Items);
-
-  EXPECT_EQ(2, std::get<0>(Values));
-  EXPECT_EQ("Tes", std::get<1>(Values));
-  EXPECT_EQ('Y', std::get<2>(Values));
-}