Wladimir J. van der Laan f8cc2b967b
Merge #17267: bench: Fix negative values and zero for -evals flag
3bb0a4674f74d22043c7911ea76ab8a4d93fed62 bench: Fix negative values and zero for -evals flag (nijynot)

Pull request description:

  This PR makes `bench_bitcoin -evals=0` evaluate at once and throws when `-evals` is a negative integer.

  ---

  Currently when you run `bench_bitcoin -evals=0`, it'll get stuck at
  ```
  # Benchmark, evals, iterations, total, min, max, median
  ```
  . This is not intuitively expected and should instead evaluate instantly as it's set to zero. Negative integers for `-evals` does not make sense either and should throw if set.

ACKs for top commit:
  laanwj:
    ACK 3bb0a4674f74d22043c7911ea76ab8a4d93fed62

Tree-SHA512: 03cd4c7c55134c7ffd8cdb6ee993551ce41061a73e13c3c047247af9df1fd7ed07d798272b643ec864099036922aaadbdcd2b798d710406f48df60b9d5448c26
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