Dead calls to these intrinsics were not being deleted at the IR level as they were not marked `IntrWillReturn`, though they were being deleted when building the SDAG. This fixes that and adds a test to confirm they are deleted during `opt`
Dead calls to these intrinsics were not being deleted at the IR level as they were not marked `IntrWillReturn`, though they were being deleted when building the SDAG. This fixes that and adds a test to confirm they are deleted during `opt`