[llvm] [InstCombine] Make indexed compare fold GEP source type independent (PR #71663)

[Yingwei Zheng via llvm-commits]

================
@@ -675,14 +651,14 @@ static Instruction *transformToIndexedCompare(GEPOperator *GEPLHS, Value *RHS,
   if (!GEPLHS->hasAllConstantIndices())
     return nullptr;
 
-  Type *ElemTy = GEPLHS->getSourceElementType();
-  Value *PtrBase, *Index;
-  std::tie(PtrBase, Index) = getAsConstantIndexedAddress(ElemTy, GEPLHS, DL);
+  Value *PtrBase;
+  APInt Offset;
+  std::tie(PtrBase, Offset) = getAsConstantIndexedAddress(GEPLHS, DL);
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dtcxzyw wrote:

```suggestion
  auto [PtrBase, Offset] = getAsConstantIndexedAddress(GEPLHS, DL);
```

https://github.com/llvm/llvm-project/pull/71663