[committed 2/2] libstdc++: Implement LWG 3465 for std::compare_partial_order_fallback [PR101056]

[Jonathan Wakely]

         PR libstdc++/101056
         * libsupc++/compare (compare_partial_order_fallback): Add
         constraint using reversed parameter order, as per LWG 3465.
         * testsuite/18_support/comparisons/algorithms/fallback.cc:
         Adjust expected result.

Tested powerpc64le-linux. Committed to trunk.


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