Use optimized library if op available #324
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Summary:
Some models (transformer models) has ops like bmm and optimized library providers a better performance than portable.
With optimized: https://www.internalfb.com/intern/aibench/details/125435623160736 (750 ms per iteration)
With portable: https://www.internalfb.com/intern/aibench/details/521699054450309 (1200 ms per iteration)
Differential Revision: D49240517