[PATCH v1 0/1] WIP: libstdc++: use is_virtual_base_of in std::weak_ptr operations

[Lichenor Forgejo Bot via Sourceware Forge]

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Version 1 of this pull request has been stored. It includes the following commits:
- libstdc++: optimize weak_ptr converting constructor/assignment - a081ba7fda52fe2a74923166a4e97976292a9155


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https://forge.sourceware.org/gcc/gcc-TEST/pulls/41#issuecomment-5607