Quant in checkpoint dtype #2025

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	56m 3s
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	13m 54s
test-xnnpack / test-backend-macos	-7s
test-xnnpack / package-golden-artifacts	3m 57s
	1h 13m 47s

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