Apply patch for binutils bug 806, approved by nickc@redhat.com.

Apply patch for binutils bug 806, approved by nickc@redhat.com.

	2005-04-03  Fred Fish  <fnf@specifixinc.com>
	* dwarf2.c (struct dwarf2_debug): Add dwarf_ranges_buffer and
	dwarf_ranges_size members.
	(struct comp_unit): Add base_address member.
	(struct funcinfo): Replace low/high members with an arange.
	(arange_add): Replace incoming "unit" parameter with "abfd" and
	"first_arange" pointers.  Reorganize/rewrite function body.
	(decode_line_info): Change arange_add call to pass bfd and arange
	pointers.
	(lookup_address_in_line_info_table): Use arange list instead of
	individual low/high members.  Walk function's arange list to find
	lowest PC in list, to test for overlapping functions.
	(read_debug_ranges): New function, reads the debug_ranges section.
	(lookup_address_in_function_table): Use arange list instead of
	individual low/high members.  Rewrite to find smallest range that
	matches.
	(read_rangelist): Read a given rangelist from debug_ranges.
	(scan_unit_for_functions): Use arange list instead of individual
	low/high members.  Handle a DW_AT_ranges attribute.
	(parse_comp_unit): Use arange list instead of individual low/high
	members.  Save comp unit base address.  Handle a DW_AT_ranges
	attribute.