stupid while loop benchmark

benchmarks/while-perf/bench.sh

+#!/bin/sh
+hyperfine '../../bx-out/target while-test.l2' 'python3 while-test.py'

benchmarks/while-perf/while-test.l2

+i := 0
+while {i < 1'000'000} {i = i + 1}

benchmarks/while-perf/while-test.py

+i = 0
+while i < 10000000: i = i + 1