Initial QSfera import

Server/vendor/github.com/dgraph-io/ristretto/z/calloc_64bit.go

@@ -0,0 +1,15 @@
+// Copyright 2020 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+//go:build amd64 || arm64 || arm64be || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x || sparc64
+// +build amd64 arm64 arm64be ppc64 ppc64le mips64 mips64le riscv64 s390x sparc64
+
+package z
+
+const (
+	// MaxArrayLen is a safe maximum length for slices on this architecture.
+	MaxArrayLen = 1<<50 - 1
+	// MaxBufferSize is the size of virtually unlimited buffer on this architecture.
+	MaxBufferSize = 256 << 30
+)