Implementation of `sync_nonpoison` and `nonpoison_mutex` #144638

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10 errors

future cannot be sent between threads safely

`std::sync::MutexGuard<'_, ()>` cannot be sent between threads safely

field `inner` of struct `std::sync::Mutex` is private

`std::sync::MutexGuard` held across a suspend point, but should not be

no method named `method` found for struct `RefCell` in the current scope

no method named `some_mutable_method` found for struct `RefCell` in the current scope

no method named `method` found for struct `std::sync::Mutex` in the current scope

no method named `method` found for struct `RwLock` in the current scope

no method named `some_mutable_method` found for struct `RwLock` in the current scope