[PATCH bfin] Don't use regno for multiple purpose

[Jie Zhang]

Internally, register data structure has a 'flags' member, but which is 
never used. All flags are added to 'regno' member, which is intended for 
register number. This patch makes use of 'flags' for flags and 'regno' 
only for register number. No functional changes. Committed.


Jie
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