* amd64-tdep.c: Include disasm.h.

	* amd64-tdep.c: Include disasm.h.
	(amd64_insn_length_fprintf, amd64_insn_length_init_dis)
	(amd64_insn_length): Moved to disasm.c and renamed.
	(fixup_riprel): Adjust.
	* disasm.c (do_ui_file_delete): New.
	(gdb_insn_length): New.
	(gdb_buffered_insn_length_fprintf)
	(gdb_buffered_insn_length_init_dis)
	(gdb_buffered_insn_length): New, moved from amd64-tdep.c, and
	renamed.
	* disasm.h (gdb_insn_length): Declare.
	(gdb_buffered_insn_length): Declare.