* config/sparc/sparc.c (arith_4096_operand, arith_add_operand,
	arith_double_4096_operand, arith_double_add_operand): New
	predicates.
	* config/sparc/sparc.h (PREDICATE_CODES): Add them, declare them.
	* config/sparc/sparc.md (adddi3, addsi3, subdi3, subsi3): Use
	them to transform add/sub 4096 into add/sub -4096.

From-SVN: r21961