[x265] Why does cuTree function calculate the averageDuration by while loop

[Ximing Cheng]

Hi, the source code in lookahead cuTree function has to calculate the
averageDuration by a while loop each time, why not use double
averageDuration = (double)m_param->fpsDenom / m_param->fpsNum; in the
initial function of lookahead? Thanks!
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