message: Add a missing forward declaration
diff: @@ -48,6 +48,7 @@ class DebugMapModule;
  class DWARFAbbreviationDeclaration;
  class DWARFAbbreviationDeclarationSet;
  class DWARFileUnit;
  +class DWARCompileUnit;
  class DWARFDebugAbbrev;
  class DWARFDebugAranges;
  class DWARFDebugInfo;
  