Merge pull request #994 from Unity-Technologies/destroy-immediate-fix

Stop using DestroyImmediate

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Sky/SkyManager.cs

             result.Apply();
 
             UnityEngine.Graphics.SetRenderTarget(null);
-            Object.DestroyImmediate(temp);
-            Object.DestroyImmediate(tempRT);
+            CoreUtils.Destroy(temp);
+            CoreUtils.Destroy(tempRT);
 
             return result;
         }