tejohnson added a comment.

Thanks, generally this seems to be good cleanup. Question on one of the changes 
below though.



================
Comment at: llvm/lib/Passes/PassBuilder.cpp:2365
+      // Don't do anything for (thin)lto backend compiles at O0.
+      if (Matches[1] != "thinlto" && Matches[1] != "lto")
+        MPM.addPass(buildO0DefaultPipeline(L, Matches[1] != "default"));
----------------
This seems to change behavior. For one, previously we were only suppressing 
adding the PGO Instr passes for ThinLTO. Now this will suppress adding the 
coroutines passes and whatever else runRegisteredEPCallbacks was doing. Also, 
it's now doing the same for regular LTO but it didn't seem to do any special 
handling in that case before. Are these changes intended?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91585/new/

https://reviews.llvm.org/D91585

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