[llvm] CodeGen: Record MMOs in finalizeBundle (PR #166210)

[Nicolai Hähnle via llvm-commits]

nhaehnle wrote:

> > This was done on an MI210. To reproduce, this should do:
> > ```
> > cmake -S llvm -B build -C offload/cmake/caches/AMDGPULibcBot.cmake -GNinja
> > cd build
> > ninja
> > ninja check-libc-amdgcn-amd-amdhsa
> > ```
> 
> Do you have any C++ or LLVM IR reproducer? It would be interesting to see why codegen changed _at all_.

Seconded. It's plausible to have codegen changes here because post-RA scheduling of memory clauses becomes more precise, but that it affects floating point tests is weird.

https://github.com/llvm/llvm-project/pull/166210