[clang] [clang] Share RecursiveASTVisitor for AST listing (PR #202661)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

While I appreciate the attempt at deduplication, I'm a bit against this one.  In ASTPrinter, all of the other options are exclusively checked in 'print'.  

Unlike the rest, this ends up bypassing quite a bit of stuff, rather than having `print` do all the differentiation? 

https://github.com/llvm/llvm-project/pull/202661