Enable saturateHost in image-classifier and address a couple resulting bugs #3443
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Summary:
This PR enables saturate host in image-classifier, so now if multiple devices are created they will be used.
As a result of this change bugs in OpenCL and CPUFunctions were exposed this PR fixes those too.
Documentation:
Test Plan: run image-classifier with num-devices >0 and backends= CPU, Interpreter, and OpenCL.