Per weight constant cache #2919

Job	Run time
test-coreml / test-backend-macos (coreml, operators) / macos-job	16m 25s
test-coreml / test-backend-macos (coreml, models) / macos-job	18m 34s
test-coreml / test-backend-linux	0s
test-coreml / package-golden-artifacts	-1s
	34m 58s

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