This issue tracks the planned improvements we would like to make in Mono to produce better LLVM IR

• Direct calls
• • Direct in-assembly calls ([runtime] Default llvm to self-init+direct native calls #13312)
• • Direct cross-module calls
• • Direct icalls
• nonnull optimization ([llvm] Propagate nonnull attribute through LLVM IR #13697)
• noalias optimizations
• • noalias annotation on allocation function return ([llvm] Give LLVM noalias info about alloc functions #13801)
• • GOT type annotation / help opt remove IntToPtr+PtrToInt ([llvm] Make GOT a typed struct #13803)
• Add LLVM community optimizers to build
• • Polly (https://polly.llvm.org/get_started.html)
• • Souper (https://www.mono-project.com/news/2018/12/06/souper/)