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

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

I believe the failure reported in the original bot is only under expensive checks (`-DLLVM_ENABLE_EXPENSIVE_CHECKS=ON`)

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