[PATCH] D137626: [test] Avoid legacy PM default pipelines (O0, O1 etc) when running opt

[Arthur Eubanks via Phabricator via llvm-commits]

aeubanks added a comment.

we should add a check in `opt.cpp` that we don't mix `-O#` with other passes (there's already a similar check for the new PM)

I've been trying to slowly remove `PassManagerBuilder` but it's quite slow and I keep getting distracted by other things


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D137626