[llvm] [DA] Test AddRecs are nsw before strong SIV test (PR #183421)

[Ryotaro Kasuga via llvm-commits]

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kasuga-fj wrote:

```suggestion
  %gep = getelementptr inbounds [4 x [2 x i16]], ptr @global, i64 0, i64 %inner.iv, i64 %outer.iv
```

Maybe this can preserve the original intent of this test.

https://github.com/llvm/llvm-project/pull/183421