Fix PR target/97939

Fix PR target/97939

The little dance around 4096 that add/sub instructions do on the SPARC
needs to be taken into account for the overflow arithmetic operations.
It cannot be done for unsigned overflow, but it can be done for signed
overflow.

gcc/ChangeLog:
	PR target/97939
	* config/sparc/predicates.md (arith_double_add_operand): Comment.
	* config/sparc/sparc.md (uaddvdi4): Use arith_double_operand.
	(addvdi4): Use arith_double_add_operand.
	(addsi3): Remove useless attributes.
	(addvsi4): Use arith_add_operand.
	(*cmp_ccv_plus): Likewise and add second alternative accordingly.
	(*cmp_ccxv_plus): Likewise.
	(*cmp_ccv_plus_set): Likewise.
	(*cmp_ccxv_plus_set): Likewise.
	(*cmp_ccv_plus_sltu_set): Likewise.
	(usubvdi4): Use arith_double_operand.
	(subvdi4): Use arith_double_add_operand.
	(subsi3): Remove useless attributes.
	(subvsi4): Use arith_add_operand.
	(*cmp_ccv_minus): Likewise and add second alternative accordingly.
	(*cmp_ccxv_minus): Likewise.
	(*cmp_ccv_minus_set): Likewise.
	(*cmp_ccxv_minus_set): Likewise.
	(*cmp_ccv_minus_sltu_set): Likewise.
	(negsi2): Use register_operand.
	(unegvsi3): Likewise.
	(negvsi3) Likewise.
	(*cmp_ccnz_neg): Likewise.
	(*cmp_ccxnz_neg): Likewise.
	(*cmp_ccnz_neg_set): Likewise.
	(*cmp_ccxnz_neg_set): Likewise.
	(*cmp_ccc_neg_set): Likewise.
	(*cmp_ccxc_neg_set): Likewise.
	(*cmp_ccc_neg_sltu_set): Likewise.
	(*cmp_ccv_neg): Likewise.
	(*cmp_ccxv_neg): Likewise.
	(*cmp_ccv_neg_set): Likewise.
	(*cmp_ccxv_neg_set): Likewise.
	(*cmp_ccv_neg_sltu_set): Likewise.

gcc/testsuite/ChangeLog:
	* gcc.target/sparc/overflow-6.c: New test.