jcstress had online deoptimization support since very beginning. It was there to hopefully improve the randomization story: with fuzzers, online deoptimization can perform many compilations in a single VM. This is now better catered by multiple forks, which allows to capture the randomization seeds for better replication, makes the VM outputs relate to one compilation session only, etc.

Therefore, Whitebox support and the related infra can be removed to ease maintenance. This also gives a test time boost on very short workloads.