Hello,

Following on from my previous patch, this zaps the old way of handling 
$fp ($pc, ...).  This in turn removes any confusion between $fp (the 
register) and $fp (the frame->base).

There is still more work though, targets are still required to define 
FP_REGNUM when they don't even have an FP register (see MIPS).  That is 
next.

Comments?
Andrew