* opcode/i386.h: Add multiple inclusion protection.

	* opcode/i386.h: Add multiple inclusion protection.
	(EAX_REG_NUM,ECX_REG_NUM,EDX_REGNUM,EBX_REG_NUM,ESI_REG_NUM)
	(EDI_REG_NUM): New macros.
	(MODRM_MOD_FIELD,MODRM_REG_FIELD,MODRM_RM_FIELD): New macros.
	(SIB_SCALE_FIELD,SIB_INDEX_FIELD,SIB_BASE_FIELD): New macros.
	(REG_PREFIX_P): New macro.

	* amd64-tdep.h (amd64_displaced_step_copy_insn): Declare.
	(amd64_displaced_step_fixup): Declare.
	* amd64-tdep.c: #include opcode/i386.h, dis-asm.h.
	(amd64_arch_regmap): Move out of amd64_analyze_stack_align
	and make static global.
	(amd64_arch_regmap_len): New static global.
	(amd64_arch_reg_to_regnum): New function.
	(struct amd64_insn): New struct.
	(struct displaced_step_closure): New struct.
	(onebyte_has_modrm,twobyte_has_modrm): New static globals.
	(rex_prefix_p,skip_prefixes)
	(amd64_insn_length_fprintf,amd64_insn_length_init_dis)
	(amd64_insn_length,amd64_get_unused_input_int_reg)
	(amd64_get_insn_details,fixup_riprel,fixup_displaced_copy)
	(amd64_displaced_step_copy_insn)
	(amd64_absolute_jmp_p,amd64_absolute_call_p,amd64_ret_p)
	(amd64_call_p,amd64_breakpoint_p,amd64_syscall_p)
	(amd64_displaced_step_fixup): New functions.
	* amd64-linux-tdep.c: #include arch-utils.h.
	(amd64_linux_init_abi): Install displaced stepping support.

	* gdb.arch/amd64-disp-step.S: New file.
	* gdb.arch/amd64-disp-step.exp: New file.
	* gdb.arch/i386-disp-step.S: New file.
	* gdb.arch/i386-disp-step.exp: New file.