Stop trying to apply HQ scaling on ridiculously-sized (>64Mpix) images since it'll cause OOM crashes.

Too-large images won't use HQ scaling and also won't display at 1:1 zoom
because we simply don't have the surface cache space available for that kind of out-of-scope image.
It will allow the user to save such images to disk and view in specialized software.

image/src/imgFrame.cpp

@@ -836,7 +836,13 @@ imgFrame::LockImageData()
     return NS_OK;
   }
 
-  return Deoptimize();
+  double imgPixelSize = mSize.width * mSize.height;
+  if (imgPixelSize < (8092 * 8092)) {
+    // We should be safe to Deoptimize at this size (<64Mpix)
+    return Deoptimize();
+  }
+  
+  return NS_ERROR_FAILURE;
 }
 
 nsresult