AST: Add a IgnoreMissingImports option to name lookup
#75158
Merged
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Control enforcement of member import visibility requirements via a new option, instead of piggy-backing on the existing
IgnoreAccessControloption. Adopt the option when doing fallback lookups for unviable members so that the compiler can diagnose the reason that a member is inaccessible more reliably. Previously, withMemberImportVisibilityenabled decls with the package access level could be mis-diagnosed as inaccessible due to their access level when really they were inaccessible due to a missing import.Resolves rdar://131501862.