Michael Kitzan a11489ae3e [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

2021-05-05 14:22:03 -07:00

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