migrator: emit error messages when migration scripts are missing. #16843
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We used to assert migration scripts exist. This patch further decouples these scripts and the compiler by treating missing scripts as a regular compiler error. Related: rdar://40538097
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@swift-ci please smoke test and merge |
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We used to assert migration scripts exist. This patch further
decouples these scripts and the compiler by treating missing scripts
as a regular compiler error.
Related: rdar://40538097