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Commit a11489ae authored by Michael Kitzan's avatar Michael Kitzan
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[MachineCSE][NFC]: Refactor and comment on preventing CSE for isConvergent instrs 

- Move the code preventing CSE of `isConvergent` instrs into
  `ProcessBlockCSE` (from `isProfitableToCSE`)
- Add comments explaining why `isConvergent` is used to prevent
  CSE of non-local instrs in MachineCSE and the new test
parent 78a7d8c4
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