beforeTrial/afterTrial not called for warmup forks

[Alex Averbuch]

I've noticed that ExternalProfiler#addJVMInvokeOptions &
ExternalProfiler#addJVMOptions are invoked for warmup forks, but that
ExternalProfiler#beforeTrial & ExternalProfiler#afterTrial are not.

On first impression it feels inconsistent.
Is this intended behavior?

Thanks