* c-typeprint.c (c_print_type): Don't crash if varstring is null.

	* c-typeprint.c (c_print_type):  Don't crash if varstring is null.
	* expprint.c expression.h (dump_expression):  Rename to
	dump_prefix_expression.
	* Print out the expression in normal form.  Call print_longest
	instead of trying to do it ourselves.
	* (dump_postfix_expression):  New function, prints out the expression
	with indentation and better formatting and interpretation.
	* parse.c (parse_exp_1):  Put calls to dump expressions under ifdef
	MAINTENANCE_CMDS and expressiondebug variable.