parser.c (cp_parser_expression_stack): Clarify why it is an array of NUM_PREC_VALUES elements.

2004-09-24  Paolo Bonzini  <bonzini@gnu.org>

	* parser.c (cp_parser_expression_stack): Clarify why it is
	an array of NUM_PREC_VALUES elements.
	(cp_parser_binary_expression): Clarify why we do not need to
	handle stack overflow.

From-SVN: r88042