[clang] [clang][ExtractAPI] Fix handling of anonymous TagDecls (PR #87772)

[Daniel Grumberg via cfe-commits]

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@@ -54,6 +54,20 @@ RecordContext *APIRecord::castToRecordContext(const APIRecord *Record) {
   }
 }
 
+void RecordContext::stealRecordChain(RecordContext &Other) {
+  // If we don't have an empty chain append Other's chain into ours.
+  if (First)
+    Last->NextInContext = Other.First;
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daniel-grumberg wrote:

Documented the invariant that `First` being non-null implies that `Last` is also non-null in an assert above.

https://github.com/llvm/llvm-project/pull/87772