Implement JEP 461: Stream Gatherers (Preview).

Implement JEP 461: Stream Gatherers (Preview).: a task in LoLBench (Harbor dataset). You are working in /workspace/jdk , a source tree checked out at the base commit for this task. Implement the requested behavior in the source tree, then run:

The task

You are working in `/workspace/jdk`, a source tree checked out at the base commit for this task. Implement the requested behavior in the source tree, then run:

Part of lolbench26/LoLBench.