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This fixes shared_ptr to allow 'final' allocators to be used. As an added bonus it also reduces the memory footprint of the shared_ptr control block when constructing a shared_ptr with an empty deleter or when using make_shared/allocate_shared. I decided not to use std::tuple here, because it's a pretty heavy template to instantiate, so added another EBO helper like the one in hashtable_policy.h -- they should be merged and reused for the other containers to fix the rest of PR 51365. PR libstdc++/51365 * include/bits/shared_ptr_base (_Sp_ebo_helper): Helper class to implement EBO safely. (_Sp_counted_base::_M_get_deleter): Add noexcept. (_Sp_counter_ptr): Use noexcept instead of comments. (_Sp_counted_deleter): Likewise. Use _Sp_ebo_helper. (_Sp_counted_ptr_inplace): Likewise. * testsuite/20_util/shared_ptr/cons/51365.cc: New. * testsuite/20_util/shared_ptr/cons/52924.cc: Add rebind member to custom allocator and test construction with custom allocator. * testsuite/20_util/shared_ptr/cons/43820_neg.cc: Adjust dg-error line number. Tested x86_64-linux, committed to trunk.
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