Show lines from input files in diagnostics.

	Show lines from input files in diagnostics.
	* source/ucs2.hh (ucs2_reader::limit): Rename to 'end'.
	(ucs2_reader::begin): New field.
	(ucs2_reader::posn): Likewise.
	(ucs2_reader::max_posn): Likewise.
	(ucs2_reader::get_uint8): Update POSN as needed.
	(ucs2_reader::get_posn): New method.
	(ucs2_reader::set_posn): Likewise.
	* source/ucs2.cc (ucs2_reader::ucs2_reader): Initialise new fields.
	* source/iconv.cc (iconv_ucs2_reader::refill): Use END instead of
	LIMIT.
	(iconv_ucs2_reader::get): Likewise.
	* source/lex.hh (lexer::get_line): New method.
	* source/lex.cc (lexer::get_line): Implementation of the above.
	* location.hh (location::get_column): New method.
	* format/format.hh (format_repr::src_lexer): New field.
	(format_repr::set_lexer): New method.
	* format/format.cc (format_repr::format_repr): Initialise SRC_LEXER.
	(format_repr::dump): Show source line, if possible, using SRC_LEXER.
	* exception.hh (exception_base::set_lexer): New method.
	* model/unit.hh (model_unit::src_lexer): New field.
	(model_unit::model_unit): Initialise SRC_LEXER.
	(model_unit::~model_unit): New destructor.
	(model_unit::set_lexer): New method.
	(model_unit::get_lexer): Likewise.
	* reader/source.cc (source_file_creator::apply): Set lexer for
	compilation unit and exception, if any.
	* source/parse.hh (parse::~parse): Do not destory token stream.
	* typedefs.hh: Rearrange inclusion of headers.
	* compiler.cc (compiler::do_analyze_unit): Set lexer for exception,
	if any.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcjx-branch@104901 138bc75d-0d04-0410-961f-82ee72b054a4