[clang] [llvm] [LLVM] Add IRNormalizer Pass (PR #68176)

[Puyan Lotfi via cfe-commits]

plotfi wrote:

@justinfargnoli Is there anything I can do to help with moving this forward, what seems to be the blocker on this at this point (asking to re-attain context)? 

https://github.com/llvm/llvm-project/pull/68176