* dwarf2read.c (dwarf_tag_name): Return const char *. Use

	* dwarf2read.c (dwarf_tag_name): Return const char *.  Use
	get_DW_TAG_name.
	(dwarf_attr_name): Return const char *.  Use get_DW_AT_name.
	(dwarf_form_name): Return const char *.  Use get_DW_FORM_name.
	(dwarf_stack_op_name): Remove.
	(dwarf_cfi_name): Return const char *.  Use get_DW_ATE_name.
	(decode_locdesc): Use get_DW_OP_name.
	* dwarf2loc.c (unimplemented): Use get_DW_OP_name.
	(dwarf2_compile_expr_to_ax): Likewise.
	(disassemble_dwarf_expression): Likewise.
	* dwarf2expr.h: (dwarf_stack_op_name): Remove.