Merge pull request #444 from EvgeniiG/Unity-2017.3

Fix reflection probe updates by checking the texture hash

ScriptableRenderPipeline/Core/TextureCache.cs

 
         private struct SSliceEntry
         {
-            public uint texId;
-            public uint countLRU;
+            public uint    texId;
+            public uint    countLRU;
+            public Hash128 hash;
         };
 
         private int m_NumTextures;
                 return sliceIndex;
 
             var texId = (uint)texture.GetInstanceID();
+            var hash  = texture.imageContentsHash;
 
             //assert(TexID!=g_InvalidTexID);
             if (texId == g_InvalidTexID) return 0;
             if (m_LocatorInSliceArray.TryGetValue(texId, out cachedSlice))
             {
                 sliceIndex = cachedSlice;
-                bFoundAvailOrExistingSlice = true;
+
+                bFoundAvailOrExistingSlice = true;
+                bSwapSlice = bSwapSlice || (m_SliceArray[sliceIndex].hash != hash);
             }
 
             // If no existing copy found in the array
                 }
             }
 
-
+                m_SliceArray[sliceIndex].hash     = hash;
 
                 if (bSwapSlice) // if this was a miss
                 {