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

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@@ -600,6 +603,15 @@ class FunctionInfo : public CommonEntityInfo {
 
   friend bool operator==(const FunctionInfo &, const FunctionInfo &);
 
+  FunctionInfo &operator|=(const FunctionInfo &RHS) {
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fahadnayyar wrote:

We can remove `|=` operator for `FunctionInfo`. I  just added it as other types had such operator. But it is probably not necessary for this patch!

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