[llvm] Minimal version of DWARF CFI validation (PR #145443)

[AmirHossein PashaeeHir via llvm-commits]

amsen20 wrote:

Please help me in:
- Breaking this implementation in re-viewable parts
- Testing each part of the implementation properly

It's my first non-mechanical PR, so any suggestion, even little is appreciated.

https://github.com/llvm/llvm-project/pull/145443