Add a new pass and conversions to emulate wide integer operations over memrefs.
The emulation is implemented on top of the existing pass to emulate wide integer arith ops.
Improve naming in the arith pass to avoid potential name clashes.
Reviewed By: antiagainst
Differential Revision: https://reviews.llvm.org/D135722
Print unsupported types on match failures.
Suggested by @Mogball and @jpienaar in D135204.
Reviewed By: Mogball
Differential Revision: https://reviews.llvm.org/D135673
