This limits our error reporting to the first 16MB of SkSL code in a
program, and error marks are limited to a run of 255 characters or
less. In practice, these limits do not affect normal code in any way.
This gives us the same tight memory footprint we originally had when
positions were stored as `int32 fLine`.
Change-Id: Idef04344324870a7b92aca154feb5e1a0121d284
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/533699
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
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