With D89158, we have the possibility of creating empty pass managers due
to callbacks choosing to not add passes under -O0. e.g. Polly can add
EP callbacks but not add any passes. This affects some tests that use
-debug-pass-manager, like the one fixed in 8eb338a92a4e.
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Thank you for the quick fix, this resolves my reported issue. I can approve if need be but it would probably be better for there to be other eyes on this :)
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Actually this causes the test to fail without polly since now there's no output since it's just an empty module pass manager. Will revert original change.