[patch/rfc] Enforce 1:1 cooked->raw map for raw register range

[Andrew Cagney]

Hello,

This patch follows up the discussion thread:
http://sources.redhat.com/ml/gdb/2002-05/msg00202.html

Cooked registers in the range [0 .. NUM{RAW}REGS) are fetched direct 
from the raw register cache, the call to the gdbarch register read/write 
method being bypassed.

This patch only affects the sh5 target and the sh5 (I'm told) already 
behaves this way.

I'll commit this it in a few days.  I'll also need to adjust the draft 
doco so that this is clearly specified.

enjoy,
Andrew
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