Patch to readelf dwarf2 handling

[Nick Clifton]

Hi Jason,

: This patch fixes some bugs and makes the output more readable.
: 
: 1999-03-29  Jason Merrill  <jason@yorick.cygnus.com>
: 
: 	* readelf.c (process_extended_line_op): end_sequence also resets
: 	the line number.
: 	(display_debug_lines): advance_line takes a signed operand.
: 	(read_and_display_attr): Print refs as <%x>, addresses as %#x,
: 	others as %d.  Handle other location expression attributes.
: 	(display_debug_info): Handle nesting.  Always print the	offset.

This is fine.  Please apply.

Cheers
	Nick