60daf3e76b
Instruction formats are now identified by a signature that doesn't include the ordering of value operands relative to immediate operands. This means that the BinaryRev instruction format becomes redundant, so delete it. The isub_imm instruction was the only one using that format. Rename it to irsub_imm to make it clear what it does now that it is printed as 'irsub_imm v2, 45'.