Package CMO: Skip deserialization error checks for same-module decls. #79157
+50
−36
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IterableDeclContext::checkDeserializeMemberErrorInPackage recursively checks if
decls and their member decls are deserialized correctly into another module.
This PR adds a check to make sure the inspected decls are from another module,
and provides an opt-in flag to fail fast on deserialization failure if found.
rdar://143830240