Use EValue::tryTo* #2988

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	14m 31s
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	1h 6m 26s
test-xnnpack / test-backend-macos	-6s
test-xnnpack / package-golden-artifacts	3m 46s
	1h 24m 37s

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