[mlir][Vector] Fix vector.extract lowering to llvm for 0-d vectors (#117731) The current implementation of lowering to llvm for vector.extract incorrectly assumes that if the number of indices is zero, the operation can be folded away. This PR removes this condition and relies on the folder to do it instead. This PR also unifies the logic for scalar extracts and slice extracts, which as a side effect also enables vector.extract lowering for n-d vector.extract with dynamic inner most dimension. (This was only prevented by a conservative check in the old implementation)
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