Support Intel AMX-AVX512

Support Intel AMX-AVX512

gcc/ChangeLog:

	* common/config/i386/cpuinfo.h (get_available_features):
	Detect AMX-AVX512.
	* common/config/i386/i386-common.cc (OPTION_MASK_ISA2_AMX_AVX512_SET,
	OPTION_MASK_ISA2_AMX_AVX512_UNSET): New.
	(ix86_handle_option): Handle -mamx-avx512.
	* common/config/i386/i386-cpuinfo.h (enum processor_features):
	Add FEATURE_AMX_AVX512.
	* common/config/i386/i386-isas.h: Add ISA_NAME_TABLE_ENTRY for
	amx-avx512.
	* config.gcc: Add amxavx512intrin.h
	* config/i386/cpuid.h (bit_AMX_AVX512): New.
	* config/i386/i386-c.cc (ix86_target_macros_internal):
	Handle amx-avx512.
	* config/i386/i386-isa.def (AMX_AVX512): Add DEF_PTA(AMX_AVX512).
	* config/i386/i386-options.cc (ix86_valid_target_attribute_inner_p):
	Handle amx-avx512.
	* config/i386/i386.opt: Add option -mamx-avx512.
	* config/i386/i386.opt.urls: Regenerated.
	* config/i386/immintrin.h: Include amxavx512intrin.h
	* doc/extend.texi: Document amx-avx512.
	* doc/invoke.texi: Document -mamx-avx512.
	* doc/sourcebuild.texi: Document target amx-avx512.
	* config/i386/amxavx512intrin.h: New file.

gcc/testsuite/ChangeLog:

	* g++.dg/other/i386-2.C: Add -mamx-avx512.
	* g++.dg/other/i386-3.C: Ditto.
	* gcc.target/i386/amx-check.h: Add cpu check for AMX-AVX512.
	* gcc.target/i386/amx-helper.h: Support amx-avx512.
	* gcc.target/i386/funcspec-56.inc: Add new target attribute.
	* gcc.target/i386/sse-12.c: Add -mamx-avx512.
	* gcc.target/i386/sse-13.c: Ditto.
	* gcc.target/i386/sse-14.c: Ditto.
	* gcc.target/i386/sse-22.c: Add amx-avx512.
	* gcc.target/i386/sse-23.c: Ditto.
	* lib/target-supports.exp (check_effective_target_amx_avx512): New.
	* gcc.target/i386/amxavx512-asmatt-1.c: New test.
	* gcc.target/i386/amxavx512-asmintel-1.c: Ditto.
	* gcc.target/i386/amxavx512-cvtrowd2ps-2.c: Ditto.
	* gcc.target/i386/amxavx512-cvtrowps2pbf16-2.c: Ditto.
	* gcc.target/i386/amxavx512-cvtrowps2ph-2.c: Ditto.
	* gcc.target/i386/amxavx512-movrow-2.c: Ditto.

Co-authored-by: Yu, Bing <bing1.yu@intel.com>