Add support for new cheri instruction encodings. The order of pattern matching is now significant because register no. fields are re-used as additional function codes in operations with fewer operands so I pulled out all decode clauses to the beginning of file for easier rearranging. Old encodings can co-exist with new encodings as the only overlap is for recently added instructions which already use the new scheme. Eventually the old encodings will go away, however, and the opcode space may be reclaimed."

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