[AArch64] Add bitcasts for lowering saturating add/sub and shift intrinsics. (#161840) This is followup patch to #157680 . In this patch, we are adding explicit bitcasts to floating-point type when lowering saturating add/sub and shift NEON scalar intrinsics using SelectionDAG, so they can be picked up by patterns added in first part of this series. To do that, we have to create new nodes for these intrinsics, which operate on floating-point types and wrap them in bitcast nodes.
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