Support VFS2 save/restore.

Inode number consistency checks are now skipped in save/restore tests for
reasons described in greatest detail in StatTest.StateDoesntChangeAfterRename.
They pass in VFS1 due to the bug described in new test case
SimpleStatTest.DifferentFilesHaveDifferentDeviceInodeNumberPairs.

Fixes #1663

PiperOrigin-RevId: 338776148
diff --git a/pkg/waiter/waiter.go b/pkg/waiter/waiter.go
index 67a9504..08519d9 100644
--- a/pkg/waiter/waiter.go
+++ b/pkg/waiter/waiter.go
@@ -168,7 +168,7 @@
 //
 // +stateify savable
 type Queue struct {
-	list waiterList   `state:"zerovalue"`
+	list waiterList
 	mu   sync.RWMutex `state:"nosave"`
 }