enabled tristate cleanup in synthesis

[jeffng-or]

Addresses design elaboration errors for a few designs when using yosys-slang.

[gemini-code-assist]

Code Review

This pull request updates the synthesis flow to improve support for the slang frontend. Changes include adding logic to resolve internal tristates in the synthesis script and configuring slang-specific arguments in the design configuration. The reviewer identified a potential issue with the conditional definition of slang arguments in the configuration file due to variable loading order and suggested defining them unconditionally using the += operator to ensure proper export.

[openroad-ci]

🔍 QoR check

Metrics reflect the PR merge build — i.e. what will land on the target branch.

Commit fbc711e · Jenkins build #2 · Baseline: build · View build on dashboard

62 design(s) checked — 0 with regression(s), 0 without a comparable baseline.