0ebb050311
reshape(reshape(x)) -> reshape(x) can be directly written as a fold instead of a canonicalization, to help other passes cleanup while they work. This initially broke ReshapeConverterExpand/Collapse, which relies on creating foldable reshapes and a carefully crafted benefit priority of patterns. I turned this into a single pattern on reshapes, which does expand and/or collapse as needed in one go. Differential Revision: https://reviews.llvm.org/D155266