Add initial infra to convert annotations to MD and display summary remarks (WIP)

[fhahn]

rebase

[thegameg]

llvm/lib/IR/Instruction.cpp

127

llvm/lib/Transforms/Scalar/AnnotationRemarks.cpp

41

[thegameg]

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

908

How does this get scheduled for LTO? This should probably run after IR linking and all that (when prototyping, I put it in TargetPassConfig for better results, but that doesn't sound like the right place to schedule passes like this in general)

llvm/lib/Transforms/Scalar/AnnotationRemarks.cpp

38

One other way would be to walk back the uses of the metadata, but it might not be worth it since it would require a ModulePass.

[fhahn]

Address most of Francis' comments, thanks!

[fhahn]

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

908

I also added it to the end of the LTO pipeline. Still need to add this for the new PM.

llvm/lib/Transforms/Scalar/AnnotationRemarks.cpp

38

Yeah that would probably be better. I'll try to update the code.

[fhahn]

I split up the patch into 2 separate ones: D91195 and D91188