RSBench raising bug

This MWE segfaults when removeAtomics is turned on in RSBench

```
// RUN: enzymexlamlir-opt %s --affine-cfg

module {
gpu.module @kernels {
gpu.func @select_index(%buffer: memref, %index: index,
%enter: i1, %choose_doubled: i1,
%value: i64) kernel {
scf.if %enter {
%doubled = arith.addi %index, %index : index
%selected = arith.select %choose_doubled, %doubled, %index : index
memref.store %value, %buffer[%selected] : memref
}

gpu.return
}
}
}
```

Start by running the supplied MWE with enzymexlamlir-opt and --affine-cfg while removeAtomics is enabled, then investigate where the segfault occurs in the RSBench path. Done means this configuration no longer segfaults and the reproducer is covered by a regression test.

Written by the indexing model from the issue text.