[AArch64][SVE] Invert VSelect operand order and condition for predicated arithmetic operations

   (vselect (setcc ( condcode) (_) (_)) (a)          (op (a) (b)))
=> (vselect (setcc (!condcode) (_) (_)) (op (a) (b)) (a))

As a follow up to D117689, invert the operand order and condition
in order to fold vselects into predicated instructions.

Differential Revision: https://reviews.llvm.org/D119424