use Access() instead of Lstat() for frequent use (#11911)

using Lstat() is causing tiny memory allocations,
that are usually wasted and never used, instead
we can simply uses Access() call that does 0
memory allocations.

cmd/os-readdir_unix.go

@@ -25,8 +25,17 @@ import (
 	"sync"
 	"syscall"
 	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
+func access(name string) error {
+	if err := unix.Access(name, unix.R_OK|unix.W_OK); err != nil {
+		return &os.PathError{Op: "lstat", Path: name, Err: err}
+	}
+	return nil
+}
+
 // The buffer must be at least a block long.
 // refer https://github.com/golang/go/issues/24015
 const blockSize = 8 << 10 // 8192