* config/tc-xtensa.h (struct xtensa_frag_type): Add lit_frchain field.

	* config/tc-xtensa.h (struct xtensa_frag_type): Add lit_frchain field.
	* config/tc-xtensa.c (xg_translate_sysreg_op,
	xtensa_translate_old_userregs_ops,
	xtensa_find_unaligned_branch_targets,
	xtensa_find_unaligned_loops, xtensa_fix_close_loop_end_frags,
	relax_frag_add_nop): Support 64-bit host.
	(xtensa_mark_literal_pool_location, xtensa_move_literals): Use
	tc_frag_data lit_frchain and lit_seg fields instead of fr_var.