[llvm] AMDGPU: Fix runtime unrolling when cascaded GEPs present (PR #147700)

[Shilei Tian via llvm-commits]

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@@ -0,0 +1,44 @@
+; RUN: opt -mtriple=amdgcn-unknown-amdhsa -passes=loop-unroll -S %s | FileCheck %s
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shiltian wrote:

```suggestion
; RUN: opt -mtriple=amdgcn-amd-amdhsa -passes=loop-unroll -S %s -o - | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/147700