make this editor cache thing editor only

make this editor cache thing editor only

Assets/ScriptableRenderPipeline/common/TextureCache.cs

             {
                 sliceIndex = m_LocatorInSliceArray[texId];
                 bFoundAvailOrExistingSlice = true;
-
+#if UNITY_EDITOR
                 if(m_TextureCacheVersion!=s_GlobalTextureCacheVersion)
                 {
                     m_TextureCacheVersion++;
+#endif
                 //assert(m_SliceArray[sliceIndex].TexID==TexID);
             }