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New ungrouping logic #2552

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Get area estimates from Yosys for unsynthesized modules and use those to make ungrouping decisions, replacing the existing solution of doing synthesis in two passes (first fully hierarchical to get area numbers, then with selective flattening)

@@ -1,6 +1,6 @@
[submodule "tools/yosys"]
path = tools/yosys
url = ../../The-OpenROAD-Project/yosys.git
url = https://github.com/povik/yosys.git
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Merging this is blocked on gettting a new Yosys release with PRs 4682, 4678, 4706

For the time being I switched to a personal branch which cherry picks those PRs

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Will #2550 suffice?

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Unfortunately, no

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