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This patch extends support for (scalable-vector) splats in the DAGCombiner via the `ISD::matchBinaryPredicate` function, which enable a variety of simple combines of constants. Users of this function may now have to distinguish between `BUILD_VECTOR` and `SPLAT_VECTOR` vector operands. The way of dealing with this in-tree follows the approach added for `ISD::matchUnaryPredicate` implemented in D94501. Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D106575
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