[benchmark] Fix setup overhead in RandomShuffle
[benchmark] Fix setup overhead in RandomShuffle

RandomShuffleLCG2 had setup overhead of 902 μs (17%) even though it already used the setUpFunction. Turns out that copying 100k element array is measurably costly.

The only way to eliminate this overhead from measurement I could think of is to let the numbersLCG array linger around (800 kB), because shuffling the IOU version had different performance.

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