[mlir] GreedyPatternRewriter: Reprocess modified ops

Ops that were modifed in-place (`finalizeRootUpdate` was called) should be reprocessed by the GreedyPatternRewriter. This is currently not happening with `GreedyRewriteConfig::maxIterations = 1`.

Note: If your project goes into an infinite loop because of this change, you likely have one or multiple faulty patterns that modify the same operations in-place (`updateRootInplace`) indefinitely.

Differential Revision: https://reviews.llvm.org/D138038