[AArch64] Add SK_Splice fixed-width costs
A fixed length SK_Splice shuffle vector is lowered to a Ext under AArch64, which should have a cost of 1. Differential Revision: https://reviews.llvm.org/D132299
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A fixed length SK_Splice shuffle vector is lowered to a Ext under AArch64, which should have a cost of 1. Differential Revision: https://reviews.llvm.org/D132299