`select_unique_by_key` regresses in CCCL 3.4 on Blackwell
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Description
Run: `cub_bench_select_unique_by_key_base_KeyT_ct__I64___ValueT_ct__F32___OffsetT_ct__I32___Elements_io__pow2__28___MaxSegSize_pow2__8`
GPU: B200
CPU: ARM64
Regression: 16.27%
This is a real compiler regression in nvcc 13.4 and nvcc 13.5, tracked by NVBug 6453290
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