* parser.c (cp_parser_binary_expression,
	cp_parser_multiplicative_expression,
	cp_parser_additive_expression, cp_parser_shift_expression,
	cp_parser_relational_expression, cp_parser_equality_expression,
	cp_parser_and_expression, cp_parser_exclusive_or_expression,
	cp_parser_inclusive_or_expression,
	cp_parser_logical_and_expression, cp_parser_logical_or_expression,
	cp_parser_binary_expression): Const-ify.

From-SVN: r60899