fix two bugs in rega

The first one was not so bad, when we a parallel move
clobbers one machine register in use, we used to
free the temporary t* using it, mark the register as
unavailable and allocate a new location for the
t*.  But this fails when all the registers are in use.
In that case, the destination of the move must be in
a register r1, so I require a swap of the register
to copy (used by t*) with r1 and update the map
accordingly.

I would like to move all the above logic in a function
dealing with clobbers in general.

The second bug is in the parallel move compiler, this
one was a little more nasty and could have caused much
debugging pain.  It would be reasonable to test it in
a similar way that I did for the slota() allocator.

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