* parser-defs.h (enum precedence): Added PREC_BUILTIN_FUNCTION.

	* parser-defs.h (enum precedence):  Added PREC_BUILTIN_FUNCTION.
	* expression.h (enum exp_opcode):  Added UNOP_LOWER, UNOP_UPPER,
	UNUP_LENGTH.
	* expprint.c (dump_expression):  Handle the new exp_opcodes.
	(print_subexp):  Handle PREC_BUILTIN_FUNCTION.
	(print_simple_m2_func):  Removed.
	(print_subexp):  Remove support for Modula2 builtin functions.
	* m2-lang.c (m2_op_print_tab):  Add support for builtin functions.
	* ch-exp.y:  Parse LOWER, UPPER, and LENGTH builtins.
	(write_lower_upper_value):  Convenience function for LOWER and UPPER.
	(upper_lower_argument, length_argument):  Removed non-terminals.
	* ch-lang.c (chill_op_print_tab):  Entries for UPPER, LOWER, LENGTH.
	(type_lower_upper):  New function.  Calculate LOWER/UPPER of type.
	(value_chill_length):  New function.  Calcalate LENGTH of ARRAY/STRING.
	(evaluate_subexp_chill):  Handle UNOP_LOWER, UNOP_UPPER, UNOP_LENGTH.
This fixes PR 5015 (and 5826 which is a duplicate).