[Patch] MIPS opcodes: fix transposed FS and FT in vadda and vmsuba

[Piotr P. Stefaniak]

Of the 36 three-operand ACC-destination VU0 macro-mode entries in
`opcodes/mips-opc.c`, all but two list FS before FT.  The two exceptions
are vadda and vmsuba.

For `vmsuba` this reversal silently changes results. The PS2 multiplier
is not symmetric in its two source fields: the Booth recoder consumes FT
while FS is shifted, so `vf[fs] * vf[ft]` and `vf[ft] * vf[fs]` differ
by one ULP.

Patch attached. If it doesn't meet your standards, please treat this
email as a Problem Report.

Piotr
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