[TOSA] MultiheadAttention legalization #4382
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- Legalize Torch scaled_dot_product_attention into TOSA by adding the necessary patterns in TorchToTosa.cpp plus backend type-conversion hooks. - Introduce a detailed decomposition path for multi-head attention within DecomposeComplexOps.cpp, preparing inputs for TOSA lowering. - Expands the PT1 e2e suite with a dedicated multi-head attention MLIR/Python test and drop the corresponding xfails now that the path works. Signed-off-by: Cathal Corbett <[email protected]> Change-Id: I96c17aefd25b979f1cf6e897d91d5a29f0a2fa85
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