Checks for split 64-bit syscall arguments are more portable
Checks for split 64-bit syscall arguments are more portable

This is described in syscall(2). Some syscalls take 64-bit arguments. On
arches that have 64-bit registers, these arguments are shipped in a register.
On 32-bit arches, however, these are split between two consecutive registers,
with some alignment requirements. Some require an odd/even pair while some
others require even/odd. For now I assume they all do what x86_32 does, and
we can handle the rest when we port those.

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