[llvm] [HLSL] Refactoring DXILABI.h to not depend on scope printer (PR #153840)

[Chris B via llvm-commits]

llvm-beanz wrote:

> ⚠️ We detected that you are using a GitHub private e-mail address to contribute to the repo. Please turn off [Keep my email addresses private](https://github.com/settings/emails) setting in your account. See [LLVM Developer Policy](https://llvm.org/docs/DeveloperPolicy.html#email-addresses) and [LLVM Discourse](https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it) for more information.

@joaosaffran you should fix this

https://github.com/llvm/llvm-project/pull/153840