Zalathar 2e36990881 coverage: Convert and check span coordinates without a local file ID
For expansion region support, we will want to be able to convert and check
spans before creating a corresponding local file ID.

If we create local file IDs eagerly, but some expansion turns out to have no
successfully-converted spans, LLVM will complain about that expansion's file ID
having no regions.
2025-03-20 13:29:32 +11:00
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