One or more Stablehlo test(s) crashing after llvm bump to 266a5a9cb9daa96c1eeaebc18e10f5a37d638734

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After bumping llvm-project to https://github.com/llvm/llvm-project/commit/266a5a9cb9daa96c1eeaebc18e10f5a37d638734, one or more Stablehlo test(s) crash and cause the CI to timeout here:
https://github.com/llvm/torch-mlir/actions/runs/9982523928/job/27588414876?pr=3544.

Python/torchvision version: stable

After running the Stablehlo tests sequentially using `python -m projects.pt1.e2e_testing.main -v --config=stablehlo -s`, the last test to run is `ReduceMaxAlongDimUnsignedInt`:

```
====================
StableHLO Backend IR
module attributes {torch.debug_module_name = "ReduceMaxAlongDimUnsignedInt"} {
func.func @forward(%arg0: tensor) -> (tensor, tensor) {
%c0 = arith.constant 0 : index
%c1 = arith.constant 1 : index
%c2 = arith.constant 2 : index
%c = stablehlo.constant dense<128> : tensor
%c_0 = stablehlo.constant dense<0> : tensor
%dim = tensor.dim %arg0, %c0 : tensor
%dim_1 = tensor.dim %arg0, %c1 : tensor
%dim_2 = tensor.dim %arg0, %c2 : tensor
%from_elements = tensor.from_elements %dim, %dim_1, %dim_2 : tensor<3xindex>
%0 = stablehlo.dynamic_iota %from_elements, dim = 1 : (tensor<3xindex>) -> tensor
%1:2 = stablehlo.reduce(%arg0 init: %c), (%0 init: %c_0) across dimensions = [1] : (tensor, tensor, tensor, tensor) -> (tensor, tensor)
reducer(%arg1: tensor, %arg3: tensor) (%arg2: tensor, %arg4: tensor) {
%2 = stablehlo.compare GE, %arg1, %arg3, SIGNED : (tensor, tensor) -> tensor
%3 = stablehlo.select %2, %arg1, %arg3 : tensor, tensor
%4 = stablehlo.compare EQ, %arg1, %arg3, SIGNED : (tensor, tensor) -> tensor
%5 = stablehlo.minimum %arg2, %arg4 : tensor
%6 = stablehlo.select %2, %arg2, %arg4 : tensor, tensor
%7 = stablehlo.select %4, %5, %6 : tensor, tensor
stablehlo.return %3, %7 : tensor, tensor
}
return %1#0, %1#1 : tensor, tensor
}
}
```
and this error occurs after it:

python: /home/avsharma/torch-mlir/externals/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:2868: llvm::LogicalResult legalizeUnresolvedMaterialization((anonymous namespace)::UnresolvedMaterializationRewrite &, DenseMap &, mlir::ConversionPatternRewriter &, mlir::detail::ConversionPatternRewriterImpl &, DenseMap> &): Assertion `newMaterialization.getType() == outputType && "materialization callback produced value of incorrect type"' failed.
Aborted (core dumped)

Reproduce the failure with projects.pt1.e2e_testing.main using the stablehlo configuration and sequential mode. Focus on ReduceMaxAlongDimUnsignedInt, the last test reported before the crash, and inspect the StableHLO IR alongside the DialectConversion.cpp assertion. Done means the StableHLO tests complete without the crash or CI timeout after the LLVM bump.

Written by the indexing model from the issue text.