added and removed more operators

Author: AnjuDel

stl/inc/xstring

@@ -1684,7 +1684,7 @@ _NODISCARD constexpr bool operator==(
     return _Lhs._Equal(_Rhs);
 }
 
-
+#if !_HAS_CXX20
 // FUNCTION TEMPLATES operator!= FOR basic_string_view
 template <class _Elem, class _Traits>
 _NODISCARD constexpr bool operator!=(
@@ -1783,7 +1783,37 @@ _NODISCARD constexpr bool operator>=(
     const basic_string_view<_Elem, _Traits> _Lhs, const _Identity_t<basic_string_view<_Elem, _Traits>> _Rhs) noexcept {
     return _Lhs.compare(_Rhs) >= 0;
 }
+#endif // !_HAS_CXX20
+
+#if _HAS_CXX20
+template <class _Traits, class = void>
+struct _Get_comparison_category {
+    using comparison_category = weak_ordering;
+};
+
+template <class _Traits>
+struct _Get_comparison_category<_Traits, void_t<typename _Traits::comparison_category>> {
+    using comparison_category = typename _Traits::comparison_category;
+};
+
+template <class _Elem, class _Traits>
+_NODISCARD constexpr typename _Get_comparison_category<_Traits>::comparison_category operator<=>(
+    const basic_string_view<_Elem, _Traits>& _Lhs, const basic_string_view<_Elem, _Traits>& _Rhs) noexcept {
+    return static_cast<typename _Get_comparison_category<_Traits>::comparison_category>(_Lhs.compare(_Rhs) <=> 0);
+}
 
+template <class _Elem, class _Traits, int = 1> // TRANSITION, VSO-409326
+_NODISCARD constexpr typename _Get_comparison_category<_Traits>::comparison_category operator<=>(
+    const _Identity_t<basic_string_view<_Elem, _Traits>> _Lhs, const basic_string_view<_Elem, _Traits> _Rhs) noexcept {
+    return static_cast<typename _Get_comparison_category<_Traits>::comparison_category>(_Lhs.compare(_Rhs) <=> 0);
+}
+
+template <class _Elem, class _Traits, int = 2> // TRANSITION, VSO-409326
+_NODISCARD constexpr typename _Get_comparison_category<_Traits>::comparison_category operator<=>(
+    const basic_string_view<_Elem, _Traits> _Lhs, const _Identity_t<basic_string_view<_Elem, _Traits>> _Rhs) noexcept {
+    return static_cast<typename _Get_comparison_category<_Traits>::comparison_category>(_Lhs.compare(_Rhs) <=> 0);
+}
+#endif // _HAS_CXX20
 
 // TYPEDEFS FOR basic_string_view
 using string_view = basic_string_view<char>;
@@ -4619,19 +4649,12 @@ _NODISCARD bool operator>=(const basic_string<_Elem, _Traits, _Alloc>& _Left, _I
 #endif // !_HAS_CXX20
 
 #if _HAS_CXX20
-template <class _Traits, class = void>
-struct _Get_comparison_category {
-    using comparison_category = weak_ordering;
-};
-template <class _Traits>
-struct _Get_comparison_category<_Traits, void_t<typename _Traits::comparison_category>> {
-    using comparison_category = typename _Traits::comparison_category;
-};
 template <class _Elem, class _Traits, class _Alloc>
 _NODISCARD typename _Get_comparison_category<_Traits>::comparison_category operator<=>(
     const basic_string<_Elem, _Traits, _Alloc>& _Left, const basic_string<_Elem, _Traits, _Alloc>& _Right) noexcept {
     return static_cast<typename _Get_comparison_category<_Traits>::comparison_category>(_Left.compare(_Right) <=> 0);
 }
+
 template <class _Elem, class _Traits, class _Alloc>
 _NODISCARD typename _Get_comparison_category<_Traits>::comparison_category operator<=>(
     const basic_string<_Elem, _Traits, _Alloc>& _Left, const _Elem* _Right) {