Add memcpy support for SPARC

[Aditya Upadhyay]

Hi Developers,

Is this ok to add memcpy implementation from Open Solaries?

https://bitbucket.org/a3217055/illumos-gate-import/src/741592a55c4c9746705ce0fd9232f5acded43ed0/usr/src/lib/libc/sparc/gen/memcpy.s?at=default&fileviewer=file-view-default

If yes, then Could you please tell us rules about modifying the
Licance of third party code?

Thanks,
Aditya Upadhyay