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`LineTable.replace` did not actually validate that the edit is in range. This could cause crashes of SourceKit-LSP if the editor is sending us bogus edits. Validate the position, like we do in all the other position conversions and log a fault if the edit is out-of-range. While fixing this, I found a couple more places where line table accesses were not properly guarded. I migrated them to safe alternatives as well. rdar://138962353