Commits on Sep 16, 2021

1. Change loop cloning condition blocks flow graph …

   Currently, the loop choice condition blocks are created in a way that creates
   a confusing flow graph. Restructure them to be simpler, and lay the path for
   future work.
   
   The simpler layout (and, hopefully, code and logic to create them) also
   lays the groundwork to potentially put the slow path loop in the loop table,
   if desired, as it creates a "standard" loop header layout.
   
   While the flow graph has an extra block or two, there are almost no diffs,
   as subsequent phases clean up any extras.
   
   There are a few diffs where the new layout enables some downstream optimization
   phases that were stymied by the old layout, but mostly in cases where we leave
   around dead code slow cloned blocks (a known issue). Also, there are a couple
   trivial CSE changes.

   

   BruceForstall committed Sep 16, 2021
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