rename: add -move-to-cell option in -wire mode

[jix]

What are the reasons/motivation for this change?

For some use cases it is desirable to transfer names from wires to their driving cells.

Explain how this is achieved.

This adds a -move-to-cell option to rename -wire which doesn't add a suffix to the cell name but instead adds a suffix to the wire name, if necessary to avoid conflicts.

It also makes rename -wire use the correct HDL indices for wires with non-zero-indexing, whether using -move-to-cell or not.

If applicable, please suggest to reviewers how they can test the change.

By replacing rename -wire with rename -wire -move-to-cell in an existing flow.

[jix]

@tspyrou @precisionmoon: This implements the renaming we were discussing. To make it easy to test this change in isolation, I rebased this PR branch on top of the Yosys commit that the ORFS master is currently using. Note that this adds a new rename variant, so testing it does require also changing rename -wire to rename -wire -move-to-cell in ORFS's synth.tcl.

[widlarizer]

This is a pattern that I created with rename -hide that prevents the new mode from doing its job as it checks whatever is the directly driven wire without traversing the tree of aliases or querying a sigmap that would have a public name promoted. The purpose for this pass is to be able to refer cells post-synthesis, so I think we can assume such a shape won't happen, but I'm not 100% sure

[ShinyKate]

@widlarizer any more feedback for this?

[precisionmoon]

I tried the new option on one design sky130hd / gcd. There is no QoR impact and the resulting FF names look fine. Is it safe to replace rename -wire with rename -wire -move-to-cell?

[widlarizer]

Yes, feel free to use this in ORFS instead of the current rename -wire @precisionmoon