[llvm] [DirectX] legalize memset (PR #136244)

[Deric C. via llvm-commits]

https://github.com/Icohedron commented:

nit: The comment above the for-loop in upcastI8AllocasAndUses is no longer accurate. The for-loop not only gathers all cast targets, it now also gathers memsets
https://github.com/llvm/llvm-project/blob/53690baacb0d1555a1fec62563ccfc94a00f607b/llvm/lib/Target/DirectX/DXILLegalizePass.cpp#L178-L179

https://github.com/llvm/llvm-project/pull/136244