chandlerc added a comment.

I'd like someone more active on the Clang side to comment about this, but here 
is my 2 cents...

It seems like it'd be nice to not populate or run or otherwise build up the 
legacy pass managers when using this option. I guess I would expect something 
to more split early between the two pipelines, and then merge back before doing 
codegen.

I'm also somewhat hesitant with the '-middle-end-...' naming, but not sure what 
would work better. We don't have anything even comparable with the legacy PM, 
so maybe just "-llvm-custom-passes" or something similar?


https://reviews.llvm.org/D21954



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