rsz: fail early if repair_setup sees a hopeless wns (> 4 * the clock …

[openroad-robot]

…period)

Fixes #4908

[QuantamHD]

Will this trigger on super high fan-out nets? Those can often be fixed easily, but have really high wns

[maliberty]

Such nets should already have been fixed by repair_design.

[QuantamHD]

Kind of a bad experience though. Can we amend the error message to either check for the presence of high fanout nets, and or let the user know that repair_setup cannot fix high fanout nets.

[oharboe]

@QuantamHD @maliberty After TNS_END_PERCENT is 100 by default, isn't this pull request more important now?

Is there a lot to be done to finish it up?

[maliberty]

There were some failures at the time and I put it in the background. I can update and see where it is now.

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[gadfort]

@maliberty what is the resolution to @QuantamHD question about warnings?

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"