ciflow/periodic-rocm-mi300/192524: [c10d] Scope the symmetric-memory lifecycle review fixes to ROCm

发生了什么

A review pass over the previous commit found residual defects in the symmetric-memory registry lifecycle. All of them share one root cause: ncclComm_t addresses are recycled. A process group's predecessor is destroyed before its successor is created, so the allocator routinely hands the successor the predecessor's address, and any bookkeeping that identifies a registration by pointer alone cannot tell the two apart.…

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