Add a8w4 kernel for Quark mix-precision#837
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Motivation
Add a modified A8W4 preshuffle GEMM kernel (from v0.1.7) at kernels/gemm/preshuffle_gemm_a8w4.py.
Port the A8W4 kernel to the current FlyDSL kernels/gemm/ layout and kernels.mma.* imports.
Include the ragged-M OOB fix by sizing A/C buffer descriptors with exact runtime num_records_bytes, preventing out-of-bounds reads/writes for non-tile-aligned M.
Quark integration: https://gitenterprise.xilinx.com/AMDNeuralOpt/Quark/pull/5866
Test Plan
Finished end to end test on Quark diffusion model Wan2.2 mix precision - w4a4/w4a8.
Compile verification:
python -m py_compile kernels/gemm/preshuffle_gemm_a8w4.py.
GPU correctness/perf tests not run locally. Recommended follow-up: run the A8W4 ragged-M validation on gfx950 with the Quark integration test once the Quark patch is applied.
Test Result
Submission Checklist