[ValueTracking] Improve isKnownNonNaN() to recognize zero splats.
isKnownNonNaN() could not recognize a zero splat because that is a ConstantAggregateZero which is-a ConstantData but not a ConstantDataVector. Patch makes a ConstantAggregateZero return true. Review: Thomas Lively Differential Revision: https://reviews.llvm.org/D74263
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