Replace atomicBool with the standard library atomic.Bool

Signed-off-by: hang.jiang <hang.jiang@daocloud.io>

pkg/process/utils.go

@@ -27,7 +27,6 @@ import (
 	"path/filepath"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/containerd/containerd/errdefs"
@@ -54,20 +53,6 @@ func (s *safePid) get() int {
 	return s.pid
 }
 
-type atomicBool int32
-
-func (ab *atomicBool) set(b bool) {
-	if b {
-		atomic.StoreInt32((*int32)(ab), 1)
-	} else {
-		atomic.StoreInt32((*int32)(ab), 0)
-	}
-}
-
-func (ab *atomicBool) get() bool {
-	return atomic.LoadInt32((*int32)(ab)) == 1
-}
-
 // TODO(mlaventure): move to runc package?
 func getLastRuntimeError(r *runc.Runc) (string, error) {
 	if r.Log == "" {