bfin.md (subsi3): Lose expander, change previously unnamed pattern into subsi3.
* config/bfin/bfin.md (subsi3): Lose expander, change previously unnamed pattern into subsi3. Use correct constraints/predicates. * config/bfin/bfin.h (CONST_OK_FOR_K): Handle "KN7". * config/bfin/predicates.md (reg_or_neg7bit_operand_p): New. From-SVN: r117455
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