i386: Remove AMX-TRANSPOSE support

i386: Remove AMX-TRANSPOSE support

AMX-TRANSPOSE is removed from ISE. Since there is no actual hardware, we
choose to directly remove it in GCC 16 and backport DMR enable part to
GCC 15.

gcc/ChangeLog:

	* common/config/i386/cpuinfo.h
	(get_available_features): Remove AMX-TRANSPOSE.
	* common/config/i386/i386-common.cc
	(OPTION_MASK_ISA2_AMX_TRANSPOSE_SET): Removed.
	(OPTION_MASK_ISA2_AMX_TRANSPOSE_UNSET): Ditto.
	(ix86_handle_option): Remove amx-transpose handle.
	* common/config/i386/i386-cpuinfo.h
	(enum processor_features): Remove FEATURE_AMX_TRANSPOSE.
	Set FEATURE_AMX_MOVRS value.
	* common/config/i386/i386-isas.h: Remove AMX-TRANSPOSE.
	* config.gcc: Do not include amxtransposeintrin.h.
	* config/i386/amxmovrsintrin.h: Remove AMX-TRANSPOSE intrins.
	* config/i386/amxtransposeintrin.h: Ditto.
	* config/i386/cpuid.h (bit_AMX_TRANSPOSE): Removed.
	* config/i386/i386.h (PTA_DIAMONDRAPIDS): Remove AMX-TRANSPOSE.
	* config/i386/i386-c.cc (ix86_target_macros_internal): Remove
	AMX_TRANSPOSE.
	* config/i386/i386-isa.def (AMX_TRANSPOSE): Removed.
	* config/i386/i386-options.cc
	(ix86_valid_target_attribute_inner_p): Remove AMX-TRANSPOSE.
	* config/i386/i386.opt: Ditto.
	* config/i386/i386.opt.urls: Ditto.
	* config/i386/immintrin.h: Remove amxtransposeintrin.h.
	* doc/extend.texi: Remove amx-transpose.
	* doc/invoke.texi: Ditto.
	* doc/sourcebuild.texi: Ditto.

gcc/testsuite/ChangeLog:

	* g++.dg/other/i386-2.C: Remove AMX-TRANSPOSE test.
	* g++.dg/other/i386-3.C: Ditto.
	* gcc.target/i386/amx-check.h: Ditto.
	* gcc.target/i386/amxmovrs-asmatt-1.c: Ditto.
	* gcc.target/i386/amxmovrs-asmintel-1.c: Ditto.
	* gcc.target/i386/funcspec-56.inc: Ditto.
	* gcc.target/i386/sse-12.c: Ditto.
	* gcc.target/i386/sse-13.c: Ditto.
	* gcc.target/i386/sse-14.c: Ditto.
	* gcc.target/i386/sse-22.c: Ditto.
	* gcc.target/i386/sse-23.c: Ditto.
	* lib/target-supports.exp: Ditto.
	* gcc.target/i386/amxmovrs-2rpntlvwrs-2.c: Removed.
	* gcc.target/i386/amxtranspose-2rpntlvw-2.c: Removed.
	* gcc.target/i386/amxtranspose-asmatt-1.c: Removed.
	* gcc.target/i386/amxtranspose-asmintel-1.c: Removed.
	* gcc.target/i386/amxtranspose-conjtcmmimfp16ps-2.c: Removed.
	* gcc.target/i386/amxtranspose-conjtfp16-2.c: Removed.
	* gcc.target/i386/amxtranspose-tcmmimfp16ps-2.c: Removed.
	* gcc.target/i386/amxtranspose-tcmmrlfp16ps-2.c: Removed.
	* gcc.target/i386/amxtranspose-tdpbf16ps-2.c: Removed.
	* gcc.target/i386/amxtranspose-tdpfp16ps-2.c: Removed.
	* gcc.target/i386/amxtranspose-tmmultf32ps-2.c: Removed.
	* gcc.target/i386/amxtranspose-transposed-2.c: Removed.