Farzon Lotfi 6457aee5b7 [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

2024-12-18 16:33:49 -05:00

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