compat: Create compat_sys_p{read,write}v64
For 32-bit ABIs which have real 64-bit registers, we don't want to
break the position argument into two. However, we still need compat
support to deal with 32-bit pointers, so we can't just use
sys_p{read,write} directly.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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