Vincent Rabaud 868aa6901f Perform greedy histogram merge in a unified way.
Previously, the stochastic method for histogram
combination could finish in a greedy way
if the number of iterations to perform so was smaller.

Except that another greedy combination was performed
afterwards ... hence wasted CPU in some cases.

Change-Id: Ic0f26873e6dc746679486b91cb35d73efee91931
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