ciflow/trunk/201842: [symm_mem] Free reserved virtual address ranges on teardown

发生了什么

map_block() reserves a virtual address (VA) range with cuMemAddressReserve. No code frees this range. ~AllocationRef unmaps and releases the memory, but it does not call cuMemAddressFree. The multicast cleanup in MulticastSetup::release() has the same problem. Each alloc and free leaks one VA range of block_size. Each peer mapping and each multicast mapping from rendezvous also leaks one range. The physical memory i…

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