Backport checkpoint restore arg layout handling to 12.9.x#2145
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Backport of the CUDA checkpoint restore argument layout handling from #2144 to the 12.9.x branch.
This keeps
CUcheckpointRestoreArgsrendering version-flexible across the checkpoint restore layouts:reservedremainscuuint64_t[8]gpuPairs,gpuPairsCount,reservedaschar[44], andreserved1gpuPairs,gpuPairsCount, andreservedaschar[52]The 12.9.x branch did not already have the
CUcheckpointGpuPairgenerated blocks that main had before #2144, so this backport includes those conditional template blocks as well.Validation: