<system_error> Enable [[msvc::noop_dtor]] from Visual Studio 2019 version 16.8.

stl/inc/system_error

@@ -513,8 +513,7 @@ public:
     }
 };
 
-//
-// TRANSITION, VSO-1043450
+// TRANSITION, Visual Studio 2019 version 16.8
 // _Immortalize_memcpy_image is used to provide a nonstandard guarantee.
 // Specifically, we want the error category objects returned from things like std::system_category() to always
 //   be available, even during DLL unload (otherwise, <system_error> would be a huge regression vs. legacy error codes).
@@ -557,6 +556,28 @@ _NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {
     static constexpr _Ty _Static;
     return _Static;
 }
+#elif defined(_MSC_VER) && _MSC_VER > 1927 && !defined(_M_CEE) // _M_CEE test is TRANSITION, VSO-1153256
+template <class _Ty>
+struct _Constexpr_immortalize_impl {
+    union {
+        _Ty _Storage;
+    };
+
+    constexpr _Constexpr_immortalize_impl() noexcept : _Storage{} {}
+
+    _Constexpr_immortalize_impl(const _Constexpr_immortalize_impl&) = delete;
+    _Constexpr_immortalize_impl& operator=(const _Constexpr_immortalize_impl&) = delete;
+
+    [[msvc::noop_dtor]] ~_Constexpr_immortalize_impl() {
+        // do nothing, allowing _Ty to be used during shutdown
+    }
+};
+
+template <class _Ty>
+_NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {
+    static _Constexpr_immortalize_impl<_Ty> _Static;
+    return _Static._Storage;
+}
 #else // choose immortalize strategy
 template <class _Ty>
 _NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {

stl/src/excptptr.cpp

@@ -37,13 +37,37 @@ extern "C" _CRTIMP2 void* __cdecl __AdjustPointer(void*, const PMD&); // defined
 using namespace std;
 
 namespace {
-#ifdef _M_CEE_PURE
+#if defined(_M_CEE_PURE)
     template <class _Ty>
     _Ty& _Immortalize() { // return a reference to an object that will live forever
         /* MAGIC */ static _Immortalizer_impl<_Ty> _Static;
         return reinterpret_cast<_Ty&>(_Static._Storage);
     }
-#else // ^^^ _M_CEE_PURE ^^^ // vvv !_M_CEE_PURE vvv
+#elif _MSC_VER > 1927 && !defined(_M_CEE) // _M_CEE test is TRANSITION, VSO-1153256
+    template <class _Ty>
+    struct _Constexpr_excptptr_immortalize_impl {
+        union {
+            _Ty _Storage;
+        };
+
+        constexpr _Constexpr_excptptr_immortalize_impl() noexcept : _Storage{} {}
+
+        _Constexpr_excptptr_immortalize_impl(const _Constexpr_excptptr_immortalize_impl&) = delete;
+        _Constexpr_excptptr_immortalize_impl& operator=(const _Constexpr_excptptr_immortalize_impl&) = delete;
+
+        [[msvc::noop_dtor]] ~_Constexpr_excptptr_immortalize_impl() {
+            // do nothing, allowing _Ty to be used during shutdown
+        }
+    };
+
+    template <class _Ty>
+    _Constexpr_excptptr_immortalize_impl<_Ty> _Immortalize_impl;
+
+    template <class _Ty>
+    _NODISCARD _Ty& _Immortalize() noexcept {
+        return _Immortalize_impl<_Ty>._Storage;
+    }
+#else // choose immortalize strategy
     template <class _Ty>
     int __stdcall _Immortalize_impl(void*, void* _Storage_ptr, void**) noexcept {
         // adapt True Placement New to _Execute_once