[llvm] [MergeFunc] Fix crash caused by bitcasting ArrayType (PR #133259)

[Florian Hahn via llvm-commits]

================
@@ -76,6 +76,41 @@ void IRBuilderBase::SetInstDebugLocation(Instruction *I) const {
     }
 }
 
+Value *IRBuilderBase::CreateAggregateCast(Value *V, Type *DestTy) {
+  Type *SrcTy = V->getType();
+  if (SrcTy == DestTy)
+    return V;
+
+  if (SrcTy->isAggregateType()) {
+    unsigned NumElements;
+    if (SrcTy->isStructTy()) {
+      assert(DestTy->isStructTy() && "Expected StructType");
+      assert(SrcTy->getStructNumElements() == DestTy->getStructNumElements() &&
+             "Expected StructTypes with equal number of elements");
+      NumElements = SrcTy->getStructNumElements();
+    } else {
+      assert(SrcTy->isArrayTy());
+      assert(DestTy->isArrayTy() && "Expected ArrayType");
----------------
fhahn wrote:

```suggestion
      assert(SrcTy->isArrayTy() && DestTy->isArrayTy() && "Expected ArrayType");
```

https://github.com/llvm/llvm-project/pull/133259