Investigate uses of Greedy Pattern Rewrite Driver

[AlexanderViand-Intel]

There have been two (somewhat) recent changes in the upstream rewrite drivers:

1. The simpler Walk Pattern Rewrite Driver has been added for situations where the fixed point iteration of the greedy rewriter is not necessary
2. The usual way to use the Greed Rewriter, applyPatternsAndFoldGreedily has been changed to applyPatternsGreedily with the decision on whether or not to also fold now configurable via the GreedyRewriteConfig parameter. Currently this defaults to still folding.

The TODO here is to investigate which of our passes that use the greedy rewrite driver can be dropped to a simple walk, and which applications of the greedy rewriter can have the folding dropped (and, e.g., moved to a later step in a pipeline).