* config/tc-z8k.c (struct z8k_exp): Remove, not used anywhere.

	* config/tc-z8k.c (struct z8k_exp): Remove, not used anywhere.
	(ctrl_table): Add "flags" keyword and some comments.
	(flag_table): Convert to uppercase.
	(get_flags_operand): Be case insensitive.
	(get_interrupt_operand): Be case insensitive.  Support notation
	where the inperrupt arguments are separated by commas.
	(get_operands): Check whether get_flags_operand consumed all
	arguments.  Return failure if get_ctrl_operand didn't recognize a
	valid control register.
	(get_specific): Add case CLASS_CTRL: Test for valid control
	register for ldctlb opcode.
	(build_bytes): Check for valid control registers.