[Bf-cycles] Tile memory deleted before rendering complete

[griffin2000]

So for me it will always crash at ToT if session_params.progressive is false,
whether or not session_params.progressive_refine is set (both in my app and
the cycles_standalone)

There is a check for progressive in TileManager::finish_tile so it will
always release the tile immediately in this case, and cause the crash.

	if(progressive) {
		return true;
	}



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