Investigate degradations after Yosys 0.60 update

[eder-matheus]

Description

After PR #3693, two designs have metric degradations that are worth investigating:

• finish__timing__setup__tns on asap7/aes
• setup_ws/tns on asap7/ethmac_lvt at multiple stages

The artifacts of the designs, before and after the update, are available here: https://drive.google.com/drive/folders/1WtUBV9FodrTTzk8c1qFkCQA2MjPQOX4u?usp=drive_link.

Suggested Solution

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Additional Context

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