[6.0] Fix SILCombine of inject_enum_addr to correctly check for unreferenceable storage #72489
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Explanation: We can't create struct values if they have unreferenceable storage. Previously
hasUnreferenceableStorage
was used to determine if the StructDecl had unreferenceable storage. This isn't sufficient because the api doesn't look in nested structs. Added a new api calledfindUnreferenceableStorage
and use it insteadScope: Effects optionals of empty types that may have nested unreferenceable storage
Issue: rdar://125125245
Original PR: #72479
Risk: Low.
Testing: Swift CI
Reviewer: @atrick @nate-chandler