target-i386: Fix SMSW for 64-bit mode
In non-64-bit modes, the instruction always stores 16 bits. But in 64-bit mode, when the destination is a register, the instruction can write 32 or 64 bits. Tested-by: NHervé Poussineau <hpoussin@reactos.org> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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