[llvm] [libc++] Ensure that `std::expected` has no tail padding (PR #69673)

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@@ -51,6 +51,7 @@ struct __libcpp_datasizeof {
   // the use as an extension.
   _LIBCPP_DIAGNOSTIC_PUSH
   _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-offsetof")
+  _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Winvalid-offsetof")
----------------
philnik777 wrote:

Where does this change come from?

https://github.com/llvm/llvm-project/pull/69673