[DAGCombiner] Enable SimplifyDemandedBits vector support for TRUNCATE (REAPPLIED).
Add DemandedElts support inside the TRUNCATE analysis. REAPPLIED - this was reverted by @hans at rGa51226057fc3 due to an issue with vector shift amount types, which was fixed in rG935bacd3a724 and an additional test case added at rG0ca81b90d19d Differential Revision: https://reviews.llvm.org/D56387
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