[Performance] Increase num_frags_z for GPUs with larger shared memory per SM
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yzh119
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Aug 13, 2024
Followup of #439 , use `constexpr` in if conditions so that `BIAS_OFFSET` won't exceed 32 at compile time.
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In our previous design
num_frags_zis fixed to 2 which is not optimal for GPUs with large shared memory per SM.