[patch][rfc] sh64: Add Pipeline Modelling and SID Support

[Dave Brolley]

I would like to commit this patch which does the following for the sh64 
target:

1) Add support for generating a SID simulator.
2) Add pipeline modelling for all sh machines (currently used only by SID).
3) Adds support for some previously unsupported insns (both SID and 
sim/sh64).

I will submit the changes needed for sim/sh64 and sid separately. The 
sim/sh simulator is currently not generated by CGEN.

NOTES:
o This is a patch against the existing sh.cpu, sh64-compact.cpu and 
sh64-media.cpu in the cgen/cpu directory and which are currently used to 
generate the sh64 simulator in sim/sh64. .cpu files also exist in the  
cpu directory, but they appear to be out of date compared to the ones in 
cgen/cpu. Any clarification regarding which files are being actively 
maintained would be much appreciated!

o The new files sh-sid.cpu and sh-sim.cpu provide pmacros for handling 
the differences between generating sid and sim.

Comments, concerns and, ultimately, approval to commit please!

Thanks,
Dave
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