[AArch64][SVE]: custom lower AVGFloor/AVGCeil.
-Lower AVGFloor(A, B) to: SRL(A) + SRL(B) + (A&B)&1. -Lower AVGCeil(A, B) to: SRL(A) + SRL(B) + (A|B)&1. Differential Revision: https://reviews.llvm.org/D143283
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