Support Intel AMX-FP8

In this patch, we will support AMX-FP8 feature. Since in the
foreseeable future, only AMX-MOVRS will also use VEX_MAP5, we
currently will not add a table of 256 entries and handle just
like MAP7.

gas/ChangeLog:

	* config/tc-i386.c: Add amx_fp8.
	* doc/c-i386.texi: Document .amx_fp8.
	* testsuite/gas/i386/x86-64.exp: Run AMX-FP8 tests.
	* testsuite/gas/i386/x86-64-amx-fp8-bad.d: New test.
	* testsuite/gas/i386/x86-64-amx-fp8-bad.s: Ditto.
	* testsuite/gas/i386/x86-64-amx-fp8-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-amx-fp8-inval.l: Ditto.
	* testsuite/gas/i386/x86-64-amx-fp8-inval.s: Ditto.
	* testsuite/gas/i386/x86-64-amx-fp8.d: Ditto.
	* testsuite/gas/i386/x86-64-amx-fp8.s: Ditto.

opcodes/ChangeLog:

	* i386-dis.c (PREFIX_VEX_MAP5_FD_X86_64_L_0_W_0): New.
	(X86_64_VEX_MAP5_FD): Ditto.
	(VEX_LEN_MAP5_FD_X86_64): Ditto.
	(VEX_W_MAP5_FD_X86_64_L_0):Ditto.
	(prefix_table): Add PREFIX_VEX_MAP5_FD_X86_64_L_0_W_0.
	(x86_64_table): Add X86_64_VEX_MAP5_FD.
	(vex_len_table): Add VEX_LEN_MAP5_FD_X86_64.
	(vex_w_table): Add VEX_W_MAP5_FD_X86_64_L_0.
	* i386-gen.c: Add CPU_AMX_FP8_FLAGS and
	CPU_ANY_AMX_FP8_FLAGS.
	* i386-init.h: Regenerated.
	* i386-mnem.h: Ditto.
	* i386-opc.h: Add cpuamx_fp8.
	* i386-opc.tbl: Add AMX_FP8 instructions.
	* i386-tbl.h: Regenerated.

Co-authored-by: Haochen Jiang <haochen.jiang@intel.com>