diff --git a/include/llvm/ADT/ArrayRef.h b/include/llvm/ADT/ArrayRef.h
index 8c14a423c8f..5b7ed9cb77d 100644
--- a/include/llvm/ADT/ArrayRef.h
+++ b/include/llvm/ADT/ArrayRef.h
@@ -97,12 +97,10 @@ namespace llvm {
     /*implicit*/ LLVM_CONSTEXPR ArrayRef(const T (&Arr)[N])
       : Data(Arr), Length(N) {}
 
-#if LLVM_HAS_INITIALIZER_LISTS
     /// Construct an ArrayRef from a std::initializer_list.
     /*implicit*/ ArrayRef(const std::initializer_list<T> &Vec)
     : Data(Vec.begin() == Vec.end() ? (T*)0 : Vec.begin()),
       Length(Vec.size()) {}
-#endif
 
     /// Construct an ArrayRef<const T*> from ArrayRef<T*>. This uses SFINAE to
     /// ensure that only ArrayRefs of pointers can be converted.
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 855a3db417f..f7de840437d 100644
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -322,16 +322,6 @@
 # define LLVM_IS_UNALIGNED_ACCESS_FAST 0
 #endif
 
-/// \brief Does the compiler support generalized initializers (using braced
-/// lists and std::initializer_list).  While clang may claim it supports general
-/// initializers, if we're using MSVC's headers, we might not have a usable
-/// std::initializer list type from the STL.  Disable this for now.
-#if __has_feature(cxx_generalized_initializers) && !defined(_MSC_VER)
-#define LLVM_HAS_INITIALIZER_LISTS 1
-#else
-#define LLVM_HAS_INITIALIZER_LISTS 0
-#endif
-
 /// \brief Mark debug helper function definitions like dump() that should not be
 /// stripped from debug builds.
 // FIXME: Move this to a private config.h as it's not usable in public headers.
diff --git a/unittests/ADT/ArrayRefTest.cpp b/unittests/ADT/ArrayRefTest.cpp
index f9c98a563fa..c6854aed4b6 100644
--- a/unittests/ADT/ArrayRefTest.cpp
+++ b/unittests/ADT/ArrayRefTest.cpp
@@ -90,4 +90,10 @@ TEST(ArrayRefTest, ConstConvert) {
   a = ArrayRef<int *>(A);
 }
 
+TEST(ArrayRefTest, InitializerList) {
+  ArrayRef<int> A{ 0, 1, 2, 3, 4 };
+  for (int i = 0; i < 5; ++i)
+    EXPECT_EQ(i, A[i]);
+}
+
 } // end anonymous namespace