Split fp8_fused_sdpa into two phases #2346
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Split fp8_fused_sdpa into two phases to decrease the TTFT.
The first phase will call fused_sdpa kernel w/o mask for prefix cached part.
The second phase will call fused_sdpa kernel with mask for the new prompt part.
Via splitting fp8_fused_sdpa into two phases, it decreases the memory consumption and also decreases the TTFT with current synapse fused_sdpa kernel.