[clang] [APINotes] Add SWIFT_RETURNS_(UN)RETAINED support to APINotes (PR #118938)

[Gábor Horváth via cfe-commits]

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@@ -1093,6 +1093,7 @@ unsigned getFunctionInfoSize(const FunctionInfo &FI) {
   for (const auto &P : FI.Params)
     size += getParamInfoSize(P);
   size += sizeof(uint16_t) + FI.ResultType.size();
+  size += FI.SwiftReturnOwnership.size();
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Xazax-hun wrote:

Is this correct? We also write the length of the string, so not sure if that is accounted for. This problem would go away if we switched to an enum.

https://github.com/llvm/llvm-project/pull/118938