Cloe v3 additions

This is a 'living' document. It will contain changes to the Cloe v3 system, mainly optimisations.

• Addition of ORRxx{S} pc,lr,#1<<n to branch into Cloe module, where <n> is 28-31. This optimises exit from routines such as ORRS pc,lr,#1<<28, where the routine exits by setting (or clearing - see below) a flag in the status register.
• Addition of BICxx{S} pc,lr,#1<<n to branch into Cloe module, where <n> is 28-31. This is the same as the above, except it clears a processor status flag.
• Translation of BIC rn,pc,#&fc000003 to MOV rn,pc.
• Translation of NV instructions to MOV r0,r0.
• Checking of code such as :
  TEQ r0,#0
BEQ is_zero
BNE not_zero
  ie. code which does a branch if one condition, followed by a branch if the other condition. This would prevent code which does this to cause problems when Cloe does the conditional check - earlier, Cloe would convert the instructions afterwards.