zlib-ng / zlib-ng / 22139686453 / 6

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Refactor and unify adler32 short length processing.

We have one function for aligning and one for tail processing. When
processing the tail, we only need to rebase if there is data left to
process, by checking for this condition we can reduce a rebase which
is benefitical for slower machines.

Used a DO4 loop maximum for the inlined tail for GCC/-O2 to limit
register pressure on x86.

For tails where MAX_LEN can be larger, we support using DO16 similar
to the default loop used in scalar C version of adler32.

Z_RESTRICT is necessary to let the compiler know that src and dst
won't overlap and that it doesn't have to account for that case.

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