(c4x_operands_match): Added check for 8-bits LDF insn. Give
warning when using constant direct bigger than 2^16. Add the new
arguments.
* include/opcode/tic4x.h: Major rewrite of entire file. Define
instruction classes, and put each instruction into a class.
* opcodes/tic4x-dis.c: (c4x_print_op): Add support for the new
argument format. Fix bug in 'N' register printer.