Move m88k memory copy and fill functions to libkern. The copy functions will
no longer share the same code, but will be instead be duplicated from the same
source, so that bcopy() and memcpy() do not

Move m88k memory copy and fill functions to libkern. The copy functions will
no longer share the same code, but will be instead be duplicated from the same
source, so that bcopy() and memcpy() do not need to check for overlap, and
memcpy() and memmove() are shorter.

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