[llvm] [LegalizeTypes] Handle non byte-sized elt types when splitting INSERT/EXTRACT_VECTOR_ELT (PR #93357)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> For non-MVT types, I don't think there's any way for a target to request custom lowering. At least, not using setOperationAction.

MVT::Other is supposed to work for this 

https://github.com/llvm/llvm-project/pull/93357