Index: include/llvm/ADT/Optional.h
===================================================================
--- include/llvm/ADT/Optional.h
+++ include/llvm/ADT/Optional.h
@@ -109,6 +109,48 @@
   }
 };
 
+template <typename T> struct OptionalStorage<T, true> {
+  AlignedCharArrayUnion<T> storage;
+  bool hasVal = false;
+
+  OptionalStorage() = default;
+
+  OptionalStorage(const T &y) : hasVal(true) { new (storage.buffer) T(y); }
+  OptionalStorage(const OptionalStorage &O) = default;
+  OptionalStorage(T &&y) : hasVal(true) {
+    new (storage.buffer) T(std::move(y));
+  }
+
+  OptionalStorage(OptionalStorage &&O) = default;
+
+  OptionalStorage &operator=(T &&y) {
+    hasVal = true;
+    new (storage.buffer) T(std::move(y));
+    return *this;
+  }
+  OptionalStorage &operator=(OptionalStorage &&O) = default;
+
+  OptionalStorage &operator=(const T &y) {
+    hasVal = true;
+    new (storage.buffer) T(y);
+    return *this;
+  }
+  OptionalStorage &operator=(const OptionalStorage &O) = default;
+
+  ~OptionalStorage() = default;
+
+  T *getPointer() {
+    assert(hasVal);
+    return reinterpret_cast<T *>(storage.buffer);
+  }
+  const T *getPointer() const {
+    assert(hasVal);
+    return reinterpret_cast<const T *>(storage.buffer);
+  }
+
+  void reset() { hasVal = false; }
+};
+
 } // namespace optional_detail
 
 template <typename T> class Optional {
Index: unittests/ADT/OptionalTest.cpp
===================================================================
--- unittests/ADT/OptionalTest.cpp
+++ unittests/ADT/OptionalTest.cpp
@@ -16,6 +16,12 @@
 
 namespace {
 
+static_assert(llvm::is_trivially_copyable<Optional<int>>::value,
+              "trivially copyable");
+
+static_assert(llvm::is_trivially_copyable<Optional<std::array<int, 3>>>::value,
+              "trivially copyable");
+
 struct NonDefaultConstructible {
   static unsigned CopyConstructions;
   static unsigned Destructions;
@@ -43,6 +49,10 @@
 unsigned NonDefaultConstructible::Destructions = 0;
 unsigned NonDefaultConstructible::CopyAssignments = 0;
 
+static_assert(
+    !llvm::is_trivially_copyable<Optional<NonDefaultConstructible>>::value,
+    "not trivially copyable");
+
 // Test fixture
 class OptionalTest : public testing::Test {
 };
@@ -201,6 +211,10 @@
 };
 unsigned MultiArgConstructor::Destructions = 0;
 
+static_assert(
+    !llvm::is_trivially_copyable<Optional<MultiArgConstructor>>::value,
+    "not trivially copyable");
+
 TEST_F(OptionalTest, Emplace) {
   MultiArgConstructor::ResetCounts();
   Optional<MultiArgConstructor> A;
@@ -248,6 +262,9 @@
 unsigned MoveOnly::Destructions = 0;
 unsigned MoveOnly::MoveAssignments = 0;
 
+static_assert(!llvm::is_trivially_copyable<Optional<MoveOnly>>::value,
+              "not trivially copyable");
+
 TEST_F(OptionalTest, MoveOnlyNull) {
   MoveOnly::ResetCounts();
   Optional<MoveOnly> O;
@@ -349,6 +366,9 @@
 unsigned Immovable::Constructions = 0;
 unsigned Immovable::Destructions = 0;
 
+static_assert(!llvm::is_trivially_copyable<Optional<Immovable>>::value,
+              "not trivially copyable");
+
 TEST_F(OptionalTest, ImmovableEmplace) {
   Optional<Immovable> A;
   Immovable::ResetCounts();