SimplifyCFG pass

• Create a separate SimplifyCFG pass.
• Add Forkify, ForkGuardElim, and ForkCoalesce back to the default schedule.

requested review from @aaronjc4

assigned to @rarbore2

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• 70cff216 - reorganize control tests

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• 7a744b2a - reorganize control tests

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• 1e8ca1f1 - Test simplify-cfg, put fork opts back in default schedule

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• 85237e42 - test on gpu as well

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merged

mentioned in commit 16d655ac