Improve micro VM primitive array performance

[Fadouse]

Summary

• add primitive array caching infrastructure in the VM interpreter to reuse pinned buffers and avoid repeated JNI region calls
• introduce an object array cache so multidimensional array rows are retained as global references instead of repeatedly fetched
• update array load/store opcodes to use the cached buffers with explicit bounds checks before dispatch

Testing

• ./gradlew test
• java -cp MatrixBench.jar MatrixBench (manual benchmark run)

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https://chatgpt.com/codex/tasks/task_e_68e083ecd15c8332a81729c8336e7ef1