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Fix the lossless decoder for the case when it has to apply other inverse transforms before applying Color indexing inverse transform. The main idea is to make ColorIndexingInverse virtually in-place: we use the fact that the argb_cache is allocated to accommodate all *unpacked* pixels of a macro-row, not just *packed* pixels. Change-Id: I27f11f3043f863dfd753cc2580bc5b36376800c4