Fixup of reference extraction to include protected internal.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp/CodeAnalysisExtensions/SymbolExtensions.cs

@@ -647,7 +647,9 @@ public static IEnumerable<AnnotatedTypeSymbol> GetAnnotatedTypeArguments(this IN
         /// Returns true if the symbol is public or protected.
         /// </summary>
         public static bool IsPublicOrProtected(this ISymbol symbol) =>
-            symbol.DeclaredAccessibility == Accessibility.Public || symbol.DeclaredAccessibility == Accessibility.Protected;
+            symbol.DeclaredAccessibility == Accessibility.Public
+            || symbol.DeclaredAccessibility == Accessibility.Protected
+            || symbol.DeclaredAccessibility == Accessibility.ProtectedOrInternal;
 
         /// <summary>
         /// Returns true if the given symbol should be extracted in this context.