Yuta Saito 0ce2810144 [Serialization] Serialize subclassScope to keep linkage ...

subclassScope was always set as NotApplicable when deserialized but we
need to serialize and deserialize it to keep correct linkage when using
SIB

```swift
open class Visitor {
    public func visit() {
        visitExprImpl()
    }
    @_optimize(none)
    private func visitExprImpl() {
    }
}
```

In this case, `visitExprImpl` is private but subclassScope is External.
So it should be lowered as an external function at LLVM IR level.

But once it's serialized into SIB, subclassScope of `visitExprImpl` was
deserialized as NotApplicable because it was not serialized. This
mismatch makes `visitExprImpl` lowered as an internal function at LLVM
IR level.

So `subclassScope` should be serialized.

2020-08-08 14:28:12 +09:00

897 B

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