linux(4): Add a comment explaining registers at syscall entry point on amd64
Differential Revision: https://reviews.freebsd.org/D40153
MFC after: 1 month
(cherry picked from commit a463dd810851fdae5efcb8f8205d742ebf221bc8)
linux(4): Add a comment explaining registers at syscall entry point on amd64 Tags None Referenced Files None Subscribers None
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