[clang] [NFC][clang][bytecode][HLSL] Refactor HLSL helper functions to use a common visitor class (PR #194393)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

Weakly LGTM but because @tbaederr has concerns, I'd like explicit [dis]approval from him before landing (his opinion should outweigh mine here).

https://github.com/llvm/llvm-project/pull/194393