`InterfaceCalls.java` makes highly predictable memory accesses, which leads to a gross time underestimate of the case where a megamorphic access is unpredictable.

Here's one example, with and without randomization. The unpredictable megamorphic call takes more than 4* as long as the benchmark.

```
Benchmark (randomized) Mode Cnt Score Error Units
InterfaceCalls.test2ndInt3Types false avgt 4 5.034 ± 0.219 ns/op
InterfaceCalls.test2ndInt3Types true avgt 4 23.407 ± 0.475 ns/op
```