[llvm] [DirectX] Let data scalarizer pass account for sub-types when updating GEP type (PR #166200)

[Finn Plummer via llvm-commits]

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@@ -42,3 +42,68 @@ define void @alloca_2d_gep_test() {
   %3 = getelementptr inbounds nuw [2 x <2 x i32>], ptr %1, i32 0, i32 %2
   ret void
 }
+
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inbelic wrote:

FYI: SCHECK denotes just running the `dxil-data-scalarization` pass and FCHECK denotes running both that and the `dxil-flatten-arrays` pass

https://github.com/llvm/llvm-project/pull/166200