Unifying i387 support

[Eli Zaretskii]

> struct i387_regs {
>   char ctrl[2];		char dummy1[2];
>   char stat[2];		char dummy2[2];
>   char tag[2];		char dummy3[2];
>   char code_off[4];
>   char code_seg[2];
>   char opcode[2];
>   char data_off[4];
>   char data_seg[2];	char dummy4[2];
>   char st[8][10];
> };

Does anyone care for the MMX view of the ST(i) registers?  Perhaps, if
we design a change in the layout, it would be better to make it
last...

Also, why did you choose to represent the registers as char buffers
instead of what they are (shorts, longs, long doubles, etc.)?