Misc. GPU improvements

• GPU backend fixes.
  • Emit float infinity properly.
  • Emit thread_block_tile variables at start of function.
• RT backend fixes.
  • Lower intrinsics.
  • Emit float infinity properly.
• Add max / min to monoid reduction cleaning (utilities for working w/ smallest/largest values of a datatype).
• Don't outline scalar constants (TODO: inline these interprocedurally later).
• Optimize edge detection schedules, especially GPU.
  • Emit a 2-level max reduction tree.

assigned to @rarbore2

added 1 commit

• ca9b2bf9 - Hm

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requested review from @aaronjc4

enabled an automatic merge when all merge checks for ca9b2bf9 pass

merged

mentioned in commit 2ce19c22