Cleanups for don't-call functions (microsoft#3905)

Author: achabense

stl/inc/functional

@@ -748,17 +748,15 @@ private:
         }
     }
 
-#if !_HAS_STATIC_RTTI
-    [[noreturn]]
-#endif // !_HAS_STATIC_RTTI
-    const type_info&
-        _Target_type() const noexcept override {
 #if _HAS_STATIC_RTTI
+    const type_info& _Target_type() const noexcept override {
         return typeid(_Callable);
-#else // _HAS_STATIC_RTTI
-        _CSTD abort();
-#endif // _HAS_STATIC_RTTI
     }
+#else // ^^^ _HAS_STATIC_RTTI / !_HAS_STATIC_RTTI vvv
+    [[noreturn]] const type_info& _Target_type() const noexcept override {
+        _CSTD abort(); // shouldn't be called, see GH-3888
+    }
+#endif // ^^^ !_HAS_STATIC_RTTI ^^^
 
     const void* _Get() const noexcept override {
         return _STD addressof(_Mypair._Myval2);
@@ -813,17 +811,15 @@ private:
         }
     }
 
-#if !_HAS_STATIC_RTTI
-    [[noreturn]]
-#endif // !_HAS_STATIC_RTTI
-    const type_info&
-        _Target_type() const noexcept override {
 #if _HAS_STATIC_RTTI
+    const type_info& _Target_type() const noexcept override {
         return typeid(_Callable);
-#else // _HAS_STATIC_RTTI
-        _CSTD abort();
-#endif // _HAS_STATIC_RTTI
     }
+#else // ^^^ _HAS_STATIC_RTTI / !_HAS_STATIC_RTTI vvv
+    [[noreturn]] const type_info& _Target_type() const noexcept override {
+        _CSTD abort(); // shouldn't be called, see GH-3888
+    }
+#endif // ^^^ !_HAS_STATIC_RTTI ^^^
 
     const void* _Get() const noexcept override {
         return _STD addressof(_Callee);

stl/inc/future

@@ -1410,9 +1410,9 @@ public:
         // Initializes _Fake_no_copy_callable_adapter with a decayed callable object and arguments
     }
 
-    _Fake_no_copy_callable_adapter(const _Fake_no_copy_callable_adapter& _Other)
+    [[noreturn]] _Fake_no_copy_callable_adapter(const _Fake_no_copy_callable_adapter& _Other)
         : _Storage(_STD move(_Other._Storage)) {
-        _STD terminate(); // Very Bad Things
+        _CSTD abort(); // shouldn't be called, see GH-3888
     }
 
     _Fake_no_copy_callable_adapter(_Fake_no_copy_callable_adapter&& _Other)          = default;

stl/inc/xutility

@@ -883,8 +883,8 @@ struct _Projected_impl {
         using _Projection = _Proj;
 
         using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>;
-        indirect_result_t<_Proj&, _It> operator*() const {
-            _CSTD abort();
+        [[noreturn]] indirect_result_t<_Proj&, _It> operator*() const {
+            _CSTD abort(); // shouldn't be called, see GH-3888
         }
     };
 };