Removed unused SystemMutex and NoMutext types

Author: linux4life798

atomiccontext_test.go

@@ -65,10 +65,6 @@ func TestLockedContext(t *testing.T) {
 		run(t, new(sync.Mutex))
 	})
 
-	t.Run("SystemMutex", func(t *testing.T) {
-		run(t, new(SystemMutex))
-	})
-
 	t.Run("SpinMutex", func(t *testing.T) {
 		run(t, new(SpinMutex))
 	})
@@ -150,10 +146,6 @@ func TestRTMContext(t *testing.T) {
 		run(t, new(sync.Mutex))
 	})
 
-	t.Run("SystemMutex", func(t *testing.T) {
-		run(t, new(SystemMutex))
-	})
-
 	t.Run("SpinMutex", func(t *testing.T) {
 		run(t, new(SpinMutex))
 	})