Revert "[libc++][TZDB] Implements time_zone::to_local. (llvm#91003)"

This reverts commit da03175.

Author: fmayer

libcxx/include/__chrono/time_zone.h

@@ -129,24 +129,6 @@ class _LIBCPP_AVAILABILITY_TZDB time_zone {
     return {};
   }
 
-  template <class _Duration>
-  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI local_time<common_type_t<_Duration, seconds>>
-  to_local(const sys_time<_Duration>& __time) const {
-    using _Dp = common_type_t<_Duration, seconds>;
-
-    sys_info __info = get_info(__time);
-
-    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
-        __info.offset >= chrono::seconds{0} || __time.time_since_epoch() >= _Dp::min() - __info.offset,
-        "cannot convert the system time; it would be before the minimum local clock value");
-
-    _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
-        __info.offset <= chrono::seconds{0} || __time.time_since_epoch() <= _Dp::max() - __info.offset,
-        "cannot convert the system time; it would be after the maximum local clock value");
-
-    return local_time<_Dp>{__time.time_since_epoch() + __info.offset};
-  }
-
   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const __impl& __implementation() const noexcept { return *__impl_; }
 
 private:

libcxx/include/chrono

@@ -778,10 +778,6 @@ class time_zone {
   template<class Duration>
   sys_time<common_type_t<Duration, seconds>>
     to_sys(const local_time<Duration>& tp, choose z) const;
-
-  template<class Duration>
-  local_time<common_type_t<Duration, seconds>>
-    to_local(const sys_time<Duration>& tp) const;
 };
 bool operator==(const time_zone& x, const time_zone& y) noexcept;                // C++20
 strong_ordering operator<=>(const time_zone& x, const time_zone& y) noexcept;    // C++20