wenlei added a comment.

> The comments indicate that this is in part due to issues with
>  the new PM loop pass manager

Wondering how different it is for these loop passes to be enabled for MonoLTO 
vs ThinLTO? If it's due to problems with the newPM, I guess ThinLTO would have 
the same problems? Asking because we have almost the same change as internal 
patch trying to get better LTO time profile precision for MonoLTO, and with 
that there's small win for oldPM+MonoLTO. But we'd love to converge on new PM 
for both MonoLTO and ThinLTO.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69732/new/

https://reviews.llvm.org/D69732



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