const internal/cpu.cpuid_AVX512GFNI

2 uses

	internal/cpu (current package)
		cpu_x86.go#L30: 	cpuid_AVX512GFNI      = 1 << 8
		cpu_x86.go#L184: 		X86.HasAVX512GFNI = isSet(ecx7, cpuid_AVX512GFNI)