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The change is conditional at the moment inside SkScan_Path.cpp, USE_NEW_BUILDER.

This chopping is meant to only pass in reasonable floats to the edgelist, so that we never
overflow when converting to fixed-point. It also has the side-effect of speeding up edges
to the left/right of the clip, since those become vertical lines, which are faster to
walk over than the original curve segment.

Future optimizations: throw away segments to the right of the clip, and tweak the edgelist
walker to not require an explicit matching right-edge for the current run.