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31633f4473
Fixes a few issues related to refleak tracking in the free-threaded build: - Count blocks in abandoned segments - Call `_mi_page_free_collect` earlier during heap traversal in order to get an accurate count of blocks in use. - Add missing refcount tracking in `_Py_DecRefSharedDebug` and `_Py_ExplicitMergeRefcount`. - Pause threads in `get_num_global_allocated_blocks` to ensure that traversing the mimalloc heaps is safe.