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C++-style lower_bound / upper_bound on a sorted array:
lower_bound — first index >= x (loop uses arr.(mid) < x)
upper_bound — first index > x (loop uses arr.(mid) <= x)
a = [|1; 2; 2; 3; 3; 3; 5; 7; 9|]
upper(x) - lower(x) gives the count of x in a:
cnt3 = 3 cnt2 = 2 cnt5 = 1 cnt9 = 1 cnt4 = 0
fingerprint = 3*1000 + 2*100 + 1*10 + 1 + 0 = 3211
Tests parallel while loops with bisection on ref, mixed strict
and non-strict comparison branches, count-via-subtraction idiom.
176 baseline programs total.