Apple

Allow int8 type in quantized_conv and im2row (#6049) #4459

Job	Run time
build-benchmark-app / macos-job	23m 32s
build-demo-ios / macos-job	13m 30s
build-frameworks-ios / macos-job	28m 28s
upload-demo-ios	22s
test-demo-ios / mobile-job (ios)	14m 23s
upload-frameworks-ios	23s
	1h 20m 38s

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