The 8472 295432b40e print walltime benchmarks with subnanosecond precision ...

example results when benchmarking 1-4 serialized ADD instructions

```
running 4 tests
test add  ... bench:           0.24 ns/iter (+/- 0.00)
test add2 ... bench:           0.48 ns/iter (+/- 0.01)
test add3 ... bench:           0.72 ns/iter (+/- 0.01)
test add4 ... bench:           0.96 ns/iter (+/- 0.01)
```

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..

bench.stdout

…

Makefile

print walltime benchmarks with subnanosecond precision

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test.stdout

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tests.rs

…