Fix SPARC memory alignment issues in Pack/Unpack functions #3858
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Fixes #3408
Unpacking and packing code is not valid for SPARC CPUs as it is working with 32bit integers on unaligned addresses. This fix reverts some 'optimizations' so that access is aligned properly.
It seems to me that other platforms can benefit from this as well (e.g. ARM will not be faster with unaligned access), but I cannot test it elsewhere and this works for us. I can however improve as needed.