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Jon Ross-Perkins
17272cf93c
This is really a set of closely related changes: 1) We really shouldn't be creating a Check::Unit for _Lower_. This fixes that by storing the diagnostic converter for reuse. 2) Rather than passing in node converters to Check as their own array, pass diagnostic converters as part of Check::Unit. 3) To support creating the converters early, pass SemIR::File pre-constructed. 4) Since SemIR::File construction was used to track "checked", add `is_checked` for that. 5) Clarifies a subtle edge case around `input_filename_` use with `-`. Note the key consequence of this change, where I actually started, is that `Check` only has one array of `Check::Unit` instead of receiving `NodeLocConverter` as a separate array.