SSE/x86_64 fix

[Alan Modra]

On Fri, 5 Jan 2001, Alan Modra wrote:

> You can probably fix this problem with the following.
> 
> {"lfence",    0, 0x0fae, 0xe8, CpuP4, FP|ImmExt,	{ 0, 0, 0 } },
> {"mfence",    0, 0x0fae, 0xf0, CpuP4, FP|ImmExt,	{ 0, 0, 0 } },
> 
> If this works (please check it, I haven't!), the patch is OK to commit
> (with spelling fix for `either')

Following up, again.  "sfence" needs fixing similarly too.

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