data: fixed indexer coverage

* revised the check if a declaration is implicit. this affects whether or not the reference to the decl should be recorded.

src/lib_parser/data/parser/cxx/ASTVisitor.h

@@ -287,6 +287,8 @@ private:
 		RefType refType,
 		SymbolType symbolType = ST_Max);
 
+	bool isImpliciit(clang::Decl* d) const;
+
     void RecordDeclRef(
             clang::NamedDecl *d,
             clang::SourceLocation beginLoc,