This reverts commit 9d7cecdd6c. Reverted https://github.com/pytorch/pytorch/pull/160925 on behalf of https://github.com/kwen2501 due to Change of course: use storage ptr as symm mem keys as in the old days and force no_split in MemPool ([comment](https://github.com/pytorch/pytorch/pull/160925#issuecomment-3215315717))
9d7cecdd6c