silence unused field warning in JavadocVisitor and SingleFileBuilder

Author: sdkrystian

source/-bitcode/BitcodeGenerator.cpp

@@ -111,7 +111,7 @@ class MultiFileBuilder : public Corpus::Visitor
 class SingleFileBuilder : public Corpus::Visitor
 {
     Corpus const& corpus_;
-    Reporter& R_;
+    [[maybe_unused]] Reporter& R_;
     std::ostream& os_;
 
 public:

source/AST/ParseJavadoc.cpp

@@ -397,7 +397,7 @@ class JavadocVisitor
 private:
     FullComment const* FC_;
     ASTContext const& ctx_;
-    Reporter& R_;
+    [[maybe_unused]] Reporter& R_;
     AnyList<Javadoc::Block> blocks_;
     AnyList<Javadoc::Param> params_;
     Javadoc::Paragraph* para_ = nullptr;