fix rnn flop profiler to compute flops instead of macs (#3833)
Co-authored-by: Guillaume Sautiere <gsautie@qti.qualcomm.com>
Co-authored-by: Cheng Li <pistasable@gmail.com>
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Michael Wyatt <michaelwyatt@microsoft.com>