[DAG] Teach isConstOrConstSplat about SPLAT_VECTORs
This teaches the DemandedElts version of isConstOrConstSplat about SPLAT_VECTORS, in the same way as the non-DemandedElts version by calling the demanded-bits version from the non-demanded-bits version. Differential Revision: https://reviews.llvm.org/D128919
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