add vendoring

vendor/golang.org/x/sys/cpu/cpu_mipsx.go

@@ -0,0 +1,12 @@
+// Copyright 2018 The Go 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 mips || mipsle
+// +build mips mipsle
+
+package cpu
+
+const cacheLineSize = 32
+
+func initOptions() {}