Alexis Laferrière 8b38d29333 Sema: Limit error on LE importing non-LE modules to SDK modules ...

Limit reporting as an error imports of a non-library-evolution module
from a library-evolution enabled module to sources that are part of the
SDK. The error also requires having enabled `InternalImportsByDefault`.
This should help prevent SDK breaking regressions while loosening the
restriction elsewhere.

Framework owners can enable `-library-level api` or `spi` to get this
check as an error, along with more sanity checks.

Other cases remain as a warning. We should look to silence it in some
cases or offer a flag to do so.

rdar://160414667

2025-09-18 11:31:36 -07:00

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