[clang] [llvm] Reland "[LLVM] Add IRNormalizer Pass" (PR #113780)

[Justin Fargnoli via cfe-commits]

justinfargnoli wrote:

> @justinfargnoli in few words the problem is in the broken link order for those two Key references.

@vvereschaka thank you for your [detail description](https://github.com/llvm/llvm-project/pull/113780#issuecomment-2448416385) of the issue. 

I've attempted to address the:
- Build issues with [Port PreservedFunctionHashAnalysis and PreservedModuleHashAnalysis to Analysis](https://github.com/llvm/llvm-project/pull/113780/commits/ef6a751a794c3e2d266cac0242629043ddd0d2aa).
- Expensive checks test failure with [Abandon PreservedFunctionHashAnalysis and PreservedModuleHashAnalysis in IRNormalizer](https://github.com/llvm/llvm-project/pull/113780/commits/5dda94115b59df2a46e8d15a2770e8e49d6153e7). 

I've verified locally that the expensive checks test failure is resolved. I think I've also verified that the [build error](https://github.com/llvm/llvm-project/pull/113780#issuecomment-2442720776) is resolved. However, could you double-check on my behalf?   

https://github.com/llvm/llvm-project/pull/113780