PR77987 Fix unique_ptr<T[], D>::reset(U) for T != U
PR libstdc++/77987 * include/bits/unique_ptr.h (unique_ptr<T[], D>::reset<U>(U)): Copy value to pointer of the correct type to swap, to support conversions allowed by LWG 2118 / N4089. * testsuite/20_util/unique_ptr/assign/assign_neg.cc: Move test for incompatible deleters from ... * testsuite/20_util/unique_ptr/assign/cv_qual.cc: ... here. * testsuite/20_util/unique_ptr/modifiers/cv_qual.cc: Move tests for incompatible pointers to ... * testsuite/20_util/unique_ptr/modifiers/reset_neg.cc: ... here. Move destructor definition to base class. Test for invalid derived-to-base conversion. From-SVN: r241235
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