Barrel shifter added

Aug 242012
 

I found I was doing a lot of sequential SRL/SRR instructions for processing nibbles and bytes, so I added an optional barrel shifter to mcx16.  Set USE_BARREL to enable it, and you can then use BRL and BRR to rotate a register left or right up to 16 bits.  It adds a few more slices to Spartan 6 usage, but speed is still above 100MHz for -3 speed grades in single cycle mode.  This release is tagged R1c.

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