[x265] Can we use binary search for q in clipQscale

[Ximing Cheng]

In RateControl::clipQscale(Frame* curFrame, RateControlEntry* rce, double q)

for (int iterations = 0; iterations < 1000 && loopTerminate != 3;
iterations++)

to find a valid q which makes the buffer at least 50% filled but no more
than 80% fulled, the code use a iteration for at most 1000 times.

Is it suitable here to use binary search for q to reduce the iterations?
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