6ec0985ad0
Previously this only happened post checking if the op is legal, but was done unconditionally post (and before other legalization patterns). Add option to not attempt folding and one to do so as last resort. Did consider but did not add a always attempt to fold option (which would have folded whether or not legal), but removed TODO about it.
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.