* config/tc-arc.c (arc_insert_operand): Change reg parm to pointer

	* config/tc-arc.c (arc_insert_operand): Change reg parm to pointer
	to table entry.  All callers changed.
	(md_shortopts): New argument -mmult.
	(md_parse_option): Recognize it.
	(md_show_usage): Print it.
	(md_begin): If -mmult, say we have the new multiply and shift insns.
	(md_assemble): Fix reloc generation for 32 bit immediate values.
	Clean up modifier handling.  Try next insn if fake operand says there's
	an error.  Update to new syntax of insertion/extraction fns.
	Recognize predefined aux regs.  Don't abort if insertion fn missing.