[clang] [APINotes] Upstream APINotes YAML compiler (PR #71413)

[Saleem Abdulrasool via cfe-commits]

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@@ -635,3 +638,496 @@ bool clang::api_notes::parseAndDumpAPINotes(StringRef YI,
 
   return false;
 }
+
+namespace {
+using namespace api_notes;
+
+class YAMLConverter {
+  const Module &TheModule;
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compnerd wrote:

```suggestion
  const Module &M;
```

https://github.com/llvm/llvm-project/pull/71413