Support Intel USER_MSR

This patches aims to support Intel USER_MSR. In addition to the usual
support, this patch includes encoding and decoding support for MAP7 and
immediate numbers as the last operand (ATT style).

gas/ChangeLog:

	* NEWS: Support Intel USER_MSR.
	* config/tc-i386.c (smallest_imm_type): Reject imm32 in 64bit
	mode.
	(build_vex_prefix): Add VEXMAP7.
	(md_assemble): Handling the imm32 of USER_MSR.
	(match_template): Handling the unusual immediate.
	* doc/c-i386.texi: Document .user_msr.
	* testsuite/gas/i386/i386.exp: Run USER_MSR tests.
	* testsuite/gas/i386/x86-64.exp: Ditto.
	* testsuite/gas/i386/user_msr-inval.l: New test.
	* testsuite/gas/i386/user_msr-inval.s: Ditto.
	* testsuite/gas/i386/x86-64-user_msr-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-user_msr-inval.l: Ditto.
	* testsuite/gas/i386/x86-64-user_msr-inval.s: Ditto.
	* testsuite/gas/i386/x86-64-user_msr.d: Ditto.
	* testsuite/gas/i386/x86-64-user_msr.s: Ditto.

opcodes/ChangeLog:
	* i386-dis.c (struct instr_info): Add a new attribute
	has_skipped_modrm.
	(Gq): New.
	(Rq): Ditto.
	(q_mm_mode): Ditto.
	(Nq): Change mode from q_mode to q_mm_mode.
	(VEX_LEN_TABLE):
	(get_valid_dis386): Add VEX_MAP7 in VEX prefix.
	and handle the map7_f8 for save space.
	(OP_Skip_MODRM): Set has_skipped_modrm.
	(OP_E): Skip codep++ when has skipped modrm byte.
	(OP_R): Support q_mode and q_mm_mode.
	(REG_VEX_MAP7_F8_L_0_W_0): New.
	(PREFIX_VEX_MAP7_F8_L_0_W_0_R_0_X86_64): Ditto.
	(X86_64_VEX_MAP7_F8_L_0_W_0_R_0): Ditto.
	(VEX_LEN_MAP7_F8): Ditto.
	(VEX_W_MAP7_F8_L_0): Ditto.
	(MOD_0F38F8): Ditto.
	(PREFIX_0F38F8_M_0): Ditto.
	(PREFIX_0F38F8_M_1_X86_64): Ditto.
	(X86_64_0F38F8_M_1): Ditto.
	(PREFIX_0F38F8): Remove.
	(prefix_table): Add PREFIX_0F38F8_M_1_X86_64.
	Remove PREFIX_0F38F8.
	(reg_table): Add REG_VEX_MAP7_F8_L_0_W_0,
	PREFIX_VEX_MAP7_F8_L_0_W_0_R_0_X86_64.
	(x86_64_table): Add X86_64_0F38F8_PREFIX_3_M_1,
	X86_64_VEX_MAP7_F8_L_0_W_0_R_0 and X86_64_0F38F8_M_1.
	(vex_table): Add VEX_MAP7.
	(vex_len_table): Add VEX_LEN_MAP7_F8,
	VEX_W_MAP7_F8_L_0.
	(mod_table): New entry for USER_MSR and
	add MOD_0F38F8.
	* i386-gen.c (cpu_flag_init): Add CPU_USER_MSR_FLAGS and
	CPU_ANY_USER_MSR_FLAGS. Add add VEXMAP7.
	* i386-init.h: Regenerated.
	* i386-mnem.h: Ditto.
	* i386-opc.h (SPACE_VEXMAP7): New.
	(CPU_USER_MSR_FLAGS): Ditoo.
	(CPU_ANY_USER_MSR_FLAGS): Ditto.
	(i386_cpu_flags): Add cpuuser_msr.
	* i386-opc.tbl: Add USER_MSR instructions.
	* i386-tbl.h: Regenerated.