[GlobalISel] Add `G_EXTRACT_VECTOR_ELT` for `computeKnownBits` (#164825) The code is ported from `SelectionDAG::computeKnownBits`. As a result of adding `G_EXTRACT_VECTOR_ELT` to `GlobalISel`, the code generated for some of the existing regression tests changes. The changes in `neon-extadd-extract.ll` and `knownbits-buildvector.mir` look good to me. Though I'm struggling to understand the diff in `sdiv.i64.ll`. Is there a test that checks if the generated amdgcn produces the correct result? Or tools that help with executing it (I do have an AMD GPU)? **Edit**: Related to #150515
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