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Re-write Predication to use FunctionEditor

rarbore2 requested to merge predication_rewrite into main
  • Write new Predication pass using FunctionEditor
    • Uses less analysis info, can work on branches outside fork-joins.
    • Supports partial predication (when some strict subset of inputs to a region form a simple branch, the corresponding strict subset of inputs to phis on the region are predicated).
  • New WritePredication pass for converting a branch over writes to a branch over data and indices inputs to a single write, reducing need for spilling in GCM.

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