x86: Remove AVX10.2 256 bit rounding support

x86: Remove AVX10.2 256 bit rounding support

Since we will support 512 bit on both P-core and E-core for AVX10, 256 bit
rounding is not that useful because we currently have rounding feature
directly on E-core now and no need to use 256-bit rounding as somehow
a workaround. This patch will remove all the support and backport to
Binutils 2.44.

gas/ChangeLog:

	* NEWS: Mention support removal.
	* config/tc-i386.c (build_evex_prefix): Remove U bit encode.
	(check_VecOperands): Remove ymm check for rounding.
	(s_insn): Revise .insn comment.
	* testsuite/gas/i386/avx10_2-256-cvt-intel.d: Remove ymm
	rounding related test.
	* testsuite/gas/i386/avx10_2-256-cvt.d: Ditto.
	* testsuite/gas/i386/avx10_2-256-cvt.s: Ditto.
	* testsuite/gas/i386/avx10_2-256-miscs-intel.d: Ditto.
	* testsuite/gas/i386/avx10_2-256-miscs.d: Ditto.
	* testsuite/gas/i386/avx10_2-256-miscs.s: Ditto.
	* testsuite/gas/i386/avx10_2-256-satcvt-intel.d: Ditto.
	* testsuite/gas/i386/avx10_2-256-satcvt.d: Ditto.
	* testsuite/gas/i386/avx10_2-256-satcvt.s: Ditto.
	* testsuite/gas/i386/evex.d: Ditto.
	* testsuite/gas/i386/evex.s: Ditto.
	* testsuite/gas/i386/i386.exp: 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_2-256-miscs-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-miscs.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-miscs.s: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-satcvt-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-satcvt.d: Ditto.
	* testsuite/gas/i386/x86-64-avx10_2-256-satcvt.s: Ditto.
	* testsuite/gas/i386/x86-64-evex.d: Ditto.
	* testsuite/gas/i386/x86-64.exp: Ditto.
	* testsuite/gas/i386/avx10_2-rounding-intel.d: Removed.
	* testsuite/gas/i386/avx10_2-rounding-inval.l: Removed.
	* testsuite/gas/i386/avx10_2-rounding-inval.s: Removed.
	* testsuite/gas/i386/avx10_2-rounding.d: Removed.
	* testsuite/gas/i386/avx10_2-rounding.s: Removed.
	* testsuite/gas/i386/x86-64-avx10_2-rounding-intel.d: Removed.
	* testsuite/gas/i386/x86-64-avx10_2-rounding.d: Removed.
	* testsuite/gas/i386/x86-64-avx10_2-rounding.s: Removed.

opcodes/ChangeLog:

	* i386-dis.c (struct instr_info): Remove U bit.
	(get_valid_dis386): Roll back to APX condition.
	* i386-opc.tbl: Remove ymm rounding support.
	* i386-tbl.h: Regenerated.