spatel added inline comments.

> mehdi_amini wrote in CGCall.cpp:1735
> I agree with getting on a path to remove these function attributes that have 
> an equivalent on per-instruction flag.
> 
> I wonder what is the status of these flags in SelectionDAG though? We still 
> have a variant of the flags on the TargetOptions I believe. Are all the uses 
> migrated to per-node flags?

Good point - I think we have to convert all codegen tests that have these 
function-level attributes to IR FMF and make sure that the output doesn't 
change. Definitely not part of this patch, but hopefully something that can be 
done incrementally, test-by-test.

https://reviews.llvm.org/D24815



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