Zihao Yu

Some unit tests are too small to generate 4-thread models. It seems that a specific multi-threading option for verilator is not suitable for all tests.

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我们也想要, 请你来贡献一下, 谢谢!

This problem still exists in firtool 1.44.0.

I didn't notice the `dev` branch. I will try it first. Thank you for the reply.