[TargetLowering] SimplifyDemandedBits - just call computeKnownBits for BUILD_VECTOR cases.
Don't do this locally, computeKnownBits does this better (and can handle non-constant cases as well). A next step would be to actually simplify non-constant elements - building on what we already do in SimplifyDemandedVectorElts. llvm-svn: 365309
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