Support Intel AVX10.2 convert instructions

Support Intel AVX10.2 convert instructions

In this patch, we will support AVX10.2 convert instructions. All
of them are new instruction forms.

Among all the instructions, vcvtbiasph2[b,h]f8[,s] needs extra care.
Since Operand 2 could indicate memory size, we do not need suffix
under ATTmode. However, we could not fold all three templates but only
XMM/YMM since the dst operand size are the same for them. Also, a new
iterator <cvt8> is added to reduce redundancy.

gas/
	* testsuite/gas/i386/i386.exp: Add AVX10.2 tests.
	* testsuite/gas/i386/x86-64.exp: Ditto.
	* testsuite/gas/i386/avx10_2-256-cvt-intel.d: New.
	* testsuite/gas/i386/avx10_2-256-cvt.d: Ditto.
	* testsuite/gas/i386/avx10_2-256-cvt.s: Ditto.
	* testsuite/gas/i386/avx10_2-512-cvt-intel.d: Ditto.
	* testsuite/gas/i386/avx10_2-512-cvt.d: Ditto.
	* testsuite/gas/i386/avx10_2-512-cvt.s: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-cvt-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-cvt.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-cvt.s: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-512-cvt-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-512-cvt.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-512-cvt.s: Ditto.

opcodes/
	* i386-dis-evex-prefix.h: Add PREFIX_EVEX_0F3874,
	PREFIX_EVEX_MAP5_18, PREFIX_EVEX_MAP5_1B,
	PREFIX_EVEX_MAP5_1E and PREFIX_EVEX_MAP5_74.
	* i386-dis-evex.h: Add table pass for AVX10.2
	instructions.
	* i386-dis.c (MOD_EVEX_0F38B1): New.
	(PREFIX_EVEX_0F3874): Ditto.
	(PREFIX_EVEX_MAP5_18): Ditto.
	(PREFIX_EVEX_MAP5_1B): Ditto.
	(PREFIX_EVEX_MAP5_1E): Ditto.
	(PREFIX_EVEX_MAP5_74): Ditto.
	* i386-opc.tbl: Add AVX10.2 instructions.
	* i386-mnem.h: Regenerated.
	* i386-tbl.h: Ditto.

Co-authored-by: Kong Lingling <lingling.kong@intel.com>
Co-authored-by: Haochen Jiang <haochen.jiang@intel.com>