RoIPool: SymInt support + meta-implem #1525

Job	Run time
linux (linux.12xlarge, cpu) / linux-job	3m 31s
linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	57s
macos (macos-12) / macos-job	2m 52s
macos (macos-m1-12) / macos-job	2m 32s
windows (windows.4xlarge, cpu) / windows-job	3m 15s
windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	11m 47s
	24m 54s

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