[SH] PATCH: Define the register groups

[Andrew STUBBS]

Hi all,

The SH port does not currently define any register groups. Instead, it 
just relies on the default in reggroup.c. This is not quite adequate as 
it is not always clear from the type where a register should naturally 
sit. In particular the 'fv' vector registers are classified as general, 
not float or vector.

The attached patch adds a function to do the register classification.

It does not know about all the registers of sh2a or any of the dsp 
variants (because I don't), but should not make the situation any worse 
for those.

Andrew Stubbs
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