493ed1ea11
* Change: In AutoSegment::canMoveUp(), hard code for FlexLib a track
reserve of one when trying to move up.
In FlexLib, the router promotes too easily METAL2 towards METAL4,
clogging the higher level. So we end up with the METAL2 level
under-saturated and the METAL4 over saturated, leading to routing
failures.
Now we assume that there is "one track less available" in METAL4.
As for now, solves the problem for LibreSOC.
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