* config/xtensa-istack.h (tinsn_struct): Replace linenum field

	* config/xtensa-istack.h (tinsn_struct): Replace linenum field
	with loc_directive_seen and debug_line.
	* config/tc-xtensa.c: Include xtensa-istack.h after dwarf2dbg.h.
	(xg_build_to_insn): Copy the new fields instead of linenum.
	(xg_build_token_insn): Likewise.  Abort on INSTR_LABEL_DEF and move
	common code out of the switch.
	(md_assemble): Set new tinsn fields from DWARF information.  Call
	dwarf2_consume_line_info.
	(xg_assemble_vliw_tokens): Update the code to select the "best" line
	number to use new information.  Call dwarf2_gen_line_info instead
	of dwarf2_emit_insn.