[patch/rfc] Zap old style standard register $fp, fix gdb/251

[Andrew Cagney]

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
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