Disable AVX512 on Darwin (#13550)

Preemptively disable AVX512 until https://github.com/golang/go/issues/49233 has been resolved.

This potentially affects reedsolomon, simdjson, sha256-simd, md5-simd packages.

Init order requires a separate package since main itself is initialized last, but imports are initialized in the order they are imported from main (confirmed).

internal/init/init.go

@@ -0,0 +1,18 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package init

internal/init/init_darwin_amd64.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package init
+
+import (
+	"github.com/klauspost/cpuid/v2"
+)
+
+func init() {
+	// Temporary workaround for
+	// https://github.com/golang/go/issues/49233
+	// Keep until upstream has been fixed.
+	cpuid.CPU.Disable(cpuid.AVX512F, cpuid.AVX512BW, cpuid.AVX512CD, cpuid.AVX512DQ,
+		cpuid.AVX512ER, cpuid.AVX512FP16, cpuid.AVX512IFMA, cpuid.AVX512PF, cpuid.AVX512VBMI,
+		cpuid.AVX512VBMI2, cpuid.AVX512VL, cpuid.AVX512VNNI, cpuid.AVX512VP2INTERSECT, cpuid.AVX512VPOPCNTDQ)
+}

main.go

@@ -20,6 +20,9 @@ package main // import "github.com/minio/minio"
 import (
 	"os"
 
+	// MUST be first import.
+	_ "github.com/minio/minio/internal/init"
+
 	minio "github.com/minio/minio/cmd"
 
 	// Import gateway