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Most Arm disassemblers, including GNU objdump and Arm's own `fromelf`, emit an instruction's raw encoding as a 32-bit words or (for Thumb) one or two 16-bit halfwords, in logical order rather than according to their storage endianness. This is generally easier to read: it matches the encoding diagrams in the architecture spec, it matches the value you'd write in a `.inst` directive, and it means that fields within the instruction encoding that span more than one byte (such as branch offsets or `SVC` immediates) can be read directly in the encoding without having to mentally reverse the bytes. llvm-objdump already has a system of PrettyPrinter subclasses which makes it easy for a target to drop in its own preferred formatting. This patch adds pretty-printers for all the Arm targets, so that llvm-objdump will display Arm instruction encodings in their preferred layout instead of little-endian and bytewise. Reviewed By: DavidSpickett Differential Revision: https://reviews.llvm.org/D130358