bors da6b55cc5e Auto merge of #89132 - Cyborus04:rc_allocator_support, r=Amanieu
Add support for allocators in `Rc` & `Arc`

Adds the ability for `std::rc:Rc`, `std::rc::Weak`, `std::sync::Arc`, and `std::sync::Weak` to live in custom allocators
2023-07-17 21:51:46 +00:00
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