fixup! AMDGPU: Fix runtime unrolling when cascaded GEPs present

Author: macurtis-amd

llvm/test/Transforms/LoopUnroll/AMDGPU/unroll-runtime.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -mtriple=amdgcn-amd-amdhsa -passes=loop-unroll -S %s | FileCheck %s
+; RUN: opt -mtriple=amdgcn-amd-amdhsa -passes=loop-unroll -S %s -o - | FileCheck %s
 
 %struct.wombat = type { %struct.zot, i32, [16 x i32], [16 x i32], i32, i32, [16 x i32], i32 }
 %struct.zot = type { i32, i32, [1024 x i32] }