SSE/x86_64 fix

[Alan Modra]

On Thu, 4 Jan 2001, Jan Hubicka wrote:

> +	/* All opcodes on i386 have eighter 1 or 2 bytes.  We may use third
> +	   byte for the SSE instructions to specify prefix they require.  */
> +	if (i.tm.base_opcode & 0xff0000)
> +	  add_prefix ((i.tm.base_opcode >> 16) & 0xff);

Err, what about `lfence' and `mfence'?
{"lfence",    0, 0x0faee8,  X, CpuP4, FP,		{ 0, 0, 0 } },
{"mfence",    0, 0x0faef0,  X, CpuP4, FP,		{ 0, 0, 0 } },

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