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Instead of computing the line number on demand, keep track of it as we
lex.
Previously, we ended up spending a quadratic amount of time computing
the line number because we'd do something like:
for every index:
count the number line breaks up to this index.
Fixes WebKit#298
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Instead of computing the line number on demand, keep track of it as we lex.
Previously, we ended up spending a quadratic amount of time computing the line number because we'd do something like:
Fixes #298