ARM Thumb hack patch

[Robert Shideleff]

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In the current SID CVS repository the ARM thumb instruction set does not work. 
It appears that a macro type thing is broken in the cgen code. I don't know 
the insides of cgen, and so I don't know how to fix it, but here is a patch 
that fixes the generated code in SID.

It is simply a repetitive removal of an extra 16 bit shift of the entire-insn 
in the thumb-decode function.

Bob
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