Replace bfd_vma type and analog types by dwarf_vma and analogs.

	Replace bfd_vma type and analog types by dwarf_vma and analogs.
	Use dwarf specific print functions to display these type values.
	* dwarf.h (dwarf_signed_vma): New type;
	(DWARF2_External_LineInfo): Replace bfd_vma by dwarf_vma.
	(DWARF2_External_PubNames): Likewise.
	(DWARF2_External_CompUnit): Likewise.
	(DWARF2_External_ARange): Likewise.
	(read_leb128): Change return type to dwarf_vma.
	* dwarf.c (print_dwarf_vma): Use __MINGW32__ conditional and
	check byte_size values.
	(dwarf_vmatoa): Change parameter type to dwarf_vma.
	(dwarf_svmatoa): New static function.
	(read_leb128): Change return type to dwarf_vma.
	(read_sleb128): New static function.
	(struct State_Machine_Registers): Change address field type to
	dwarf_vma.
	(process_extended_line_op): Adapt to type changes.
	(fetch_indirect_string): Likewise.
	(idisplay_block): Likewise.
	(decode_location_expression): Likewise.
	(read_and_display_attr_value): Likewise.
	(process_debug_info): Likewise.
	(display_debug_lines_raw): Likewise.
	(display_debug_lines_decoded): Likewise.
	(SLEB macro): Use new read_sleb128 function.