Pete Bacon Darwin e8900824dd perf(ngcc): use line start positions for computing offsets in source-map flattening (#36027)
By computing and caching the start of each line, rather than the length
of each line, we can save a lot of duplicated computation in the `segmentDiff()`
and `offsetSegment()` functions.

PR Close #36027
2020-03-13 08:00:28 -07:00
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