[PATCH] Fix Blackfin instruction mode checking

[Jie Zhang]

I have committed this patch to fix instruction mode checking for 
Blackfin. Initially, the Blackfin gas code was written according to 
Blackfin programming manual. But finally, it was found that the manual 
didn't document all valid instruction modes for several instructions. 
This patch adds all such modes for those instructions. I summarized the 
Blackfin instruction modes in the following page:

http://docs.blackfin.uclinux.org/doku.php?id=bfin:instruction_modes

This patch also adds mode checking for 16-bit multiply instructions.


Jie
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