re PR c++/89336 (internal compiler error when compiling a constexpr function)
PR c++/89336 * constexpr.c (cxx_eval_store_expression): Diagnose changing of active union member for -std=c++17 and earlier. * g++.dg/cpp1y/constexpr-89336-3.C: New test. From-SVN: r269052
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