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0b896101b4
Reduce calls to Malloc (WebPSafeMalloc/WebPSafeCalloc) for: - Building HashChain data-structure used in creating the backward references. - Creating Backward references for LZ77 or RLE coding. - Creating Huffman tree for encoding the image. For the above mentioned code-paths, allocate memory once and re-use it subsequently. Reduce the foorprint of VP8LHistogram struct by changing the Struct field 'literal_' from an array of constant size to dynamically allocated buffer based on the input parameter cache_bits. Initialize BitWriter buffer corresponding to 16bpp (2*W*H). There are some hard-files that are compressed at 12 bpp or more. The realloc is costly and can be avoided for most of the WebP lossless images by allocating some extra memory at the encoder initializaiton. Change-Id: I1ea8cf60df727b8eb41547901f376c9a585e6095