fix microbenchmarks to be more alike

[KristofferC]

Moved from https://github.com/JuliaLang/julia/issues/13729

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See: https://github.com/JuliaLang/julia/pull/13673

[cgay]

It looks to me like the Go, Python, and Julia versions of recursion_quicksort treat the creation and filling of the random array differently:

• Go: create outside the timing, set random values inside the timing
• Python: create and initialize outside the timing
• Julia: create and initialize inside the timing (I know nothing about Julia though)