[texture_cache] Skip alias synchronization in texture cache when the image has no aliases. (#3740)

PrepareImage() is on a very hot path and previously called SynchronizeAliases() unconditionally.  For most images, aliased_images` is empty, so this created unnecessary overhead, now we only synchronize only when image requires it

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3740
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: wildcard <wildcard@eden-emu.dev>
Co-committed-by: wildcard <wildcard@eden-emu.dev>

src/video_core/texture_cache/texture_cache.h

@@ -2733,7 +2733,9 @@ void TextureCache<P>::PrepareImage(ImageId image_id, bool is_modification, bool
         }
     } else {
         RefreshContents(image, image_id);
-        SynchronizeAliases(image_id);
+        if (!image.aliased_images.empty()) {
+            SynchronizeAliases(image_id);
+        }
     }
     if (is_modification) {
         MarkModification(image);