[llvm] [llubi] Refactor library into llvm/lib (PR #223745)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw commented:

I am fine with moving it into llvm/lib if someone wants to reuse it in downstream projects. However, it is clear that the public API still requires significant adjustments. I believe it should reach a usable state before the release of LLVM 24.


https://github.com/llvm/llvm-project/pull/223745