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This gives a good performance increase, and usually also improves compression.
Make separate define HASH_SLIDE for fallback version of UPDATE_HASH.
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poor performance on levels 6 and 9 especially with optimized versions of UPDATE_HASH.
From commit d306c75d3bb36cba73aec9b3b3ca378e31d1799e:
.. we hash 4 bytes, instead of 3, for certain levels. This shortens the hash chains, and also improves the quality
of each hash entry.
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unaligned conditionally compiled code for insert_string and quick_insert_string. Unify sse42 crc32 assembly between insert_string and quick_insert_string. Modified quick_insert_string to work across architectures.
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