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wifi: optimize OfdmPhy::GetPayloadDuration()

Tolik Zinovyev requested to merge tolikzinovyev/ns-3-dev:optimize-ofdm-phy-get-payload-duration into master

This PR introduces simple optimizations like avoiding converting to and from ns3::Time and precomputing numbers at compile time. In my simulation the cost of OfdmPhy::GetPayloadDuration() went down from 3.45% of CPU time to 2.61%.

Edited by Tolik Zinovyev

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