Support Intel MOVRS

This patch focus on supporting MOVRS ISA. We could take this full ISA
as four part: PREFETCHRST2, MOVRS, MOVRS APX_F extension and MOVRS AVX10.2
extension.

The APX_F extension for MOVRS will be:
  - EVEX.LLZ.NP.MAP4.WIG 8A !(11):rrr:bbb for r8/m8 with NF=0 and
    ND=0
  - EVEX.LLZ.NP/66.MAP4.SCALABLE 8B !(11):rrr:bbb for rv/mv with NF=0
    and ND=0

We did not merge the table together for APX_F since there is an explicit
x64 for movrs insn. The current APX_F() did not support the combination
between CPUIDs. Also, the space is different for legacy and apx_f forms.

gas/ChangeLog:

	* NEWS: Support Intel MOVRS.
	* config/tc-i386.c: Add MOVRS.
	* doc/c-i386.texi: Document .movrs.
	* testsuite/gas/i386/i386.exp: Run MOVRS tests.
	* testsuite/gas/i386/x86-64.exp: Ditto.
        * testsuite/gas/i386/x86-64-apx-evex-promoted-intel.d: Add MOVRS
	tests.
        * testsuite/gas/i386/x86-64-apx-evex-promoted-wig.d: Ditto.
        * testsuite/gas/i386/x86-64-apx-evex-promoted.d: Ditto.
        * testsuite/gas/i386/x86-64-apx-evex-promoted.s: Ditto.
	* testsuite/gas/i386/lfence-load.d: Add prefetchrst2.
	* testsuite/gas/i386/lfence-load.s: Ditto.
	* testsuite/gas/i386/nops-8.d: Ditto.
	* testsuite/gas/i386/prefetch-intel.d: Ditto.
	* testsuite/gas/i386/prefetch.d: Ditto.
	* testsuite/gas/i386/x86-64-lfence-load.d: Ditto.
	* testsuite/gas/i386/x86-64-lfence-load.s: Ditto.
	* testsuite/gas/i386/x86-64-prefetch-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-prefetch.d: Ditto.
	* testsuite/gas/i386/movrs-intel.d: New test.
	* testsuite/gas/i386/movrs-inval.l: Ditto.
	* testsuite/gas/i386/movrs-inval.s: Ditto.
	* testsuite/gas/i386/movrs.d: Ditto.
	* testsuite/gas/i386/movrs.s: Ditto.
	* testsuite/gas/i386/x86-64-movrs-avx10_2-256-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs-avx10_2-256.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs-avx10_2-256.s: Ditto.
	* testsuite/gas/i386/x86-64-movrs-avx10_2-512-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs-avx10_2-512.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs-avx10_2-512.s: Ditto.
	* testsuite/gas/i386/x86-64-movrs-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs.s: Ditto.
	* testsuite/gas/i386/x86-64-movrs-intel-suffix.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs-suffix.d: Ditto.
	* testsuite/gas/i386/x86-64-movrs-suffix.s: Ditto.

opcodes/ChangeLog:

	* i386-dis-evex-prefix.h: Add PREFIX_EVEX_MAP5_6F_X86_64.
	* i386-dis-evex-x86.h: Add X86_64_EVEX_MAP5_6F.
	* i386-dis-evex.h (evex_table): New entry for movrs.
	* i386-dis.c (MOD_0F18_REG_4): New.
	(PREFIX_EVEX_MAP5_6F_X86_64): Ditto.
	(X86_64_0F388A): Ditto.
	(X86_64_0F388B): Ditto.
	(X86_64_EVEX_MAP5_6F): Ditto.
	(three_byte_table): New entry for MOVRS.
	(reg_table): Ditto.
	(mod_table): Ditto.
	(x86_64_table): Ditto. Also include i386-dis-evex-x86.h.
	* i386-gen.c (cpu_flags): Add MOVRS.
	* i386-init.h: Regenerated.
	* i386-mnem.h: Ditto.
	* i386-opc.h (i386_cpu_flags): Add cpumovrs.
	* i386-opc.tbl: Add MOVRS instrctions.
	* i386-tbl.h: Regenerated.

Co-authored-by: Haochen Jiang <haochen.jiang@intel.com>
Co-authored-by: Lili Cui <lili.cui@intel.com>