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mha: make impl_ptr_map caceh in fmha_v3_bwd and fmha_fwd_v3 thread-safe. #2201

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restores csrc/cpp_itfs/mha_fwd.cu because it breaks XLA

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mha: make impl_ptr_map caceh in fmha_v3_bwd and fmha_fwd_v3 thread-safe. #2201

restores csrc/cpp_itfs/mha_fwd.cu because it breaks XLA
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succeeded Mar 6, 2026 in 1m 38s