[DirectX] Bug fix for Data Scalarization crash (#118426) Two bugs here. First calling `Inst->getFunction()` has undefined behavior if the instruction is not tracked to a function. I suspect the `replaceAllUsesWith` was leaving the GEPs in a weird ghost parent situation. I switched up the visitor to be able to `eraseFromParent` as part of visiting and then everything started working. The second bug was in `DXILFlattenArrays.cpp`. I was unaware that you can have multidimensional arrays of `zeroinitializer`, and `undef` so fixed up the initializer to handle these two cases. fixes #117273
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