[mlir][Vector] Generate poison vectors in vector.shape_cast lowering (#125613) This is the first PR that introduces `ub.poison` vectors as part of a rewrite/conversion pattern in the Vector dialect. It replaces the `arith.constant dense<0>` vector initialization for `vector.insert_slice` ops with a poison vector. This PR depends on all the previous PRs that introduced support for poison in Vector operations such as `vector.shuffle`, `vector.extract`, `vector.insert`, including ODS, canonicalization and lowering support. This PR may improve end-to-end compilation time through LLVM, depending on the workloads.
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