Pass manager + forkify

• Basic pass manager implementation
  • Supports non-codegen analyses and transformations
• Implement forkify pass for very specific natural loop formation
  • So, this pass is really just matching a complicated pattern and doing a replacement on it - the code is way more complex than I would like for implementing such a simple transformation, might be worth some though on how to make this simpler / automate generation of these kinds of transformations, I imagine there's some opportunity given our uniform node graph IR

requested review from @aaronjc4

assigned to @rarbore2

added 1 commit

• 70becedf - Forkify loops with static constant bounds

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mentioned in commit 59072d67

merged