[Triton/Gluon] enable TDM fusion on MXFP4

[Boss2002n]

Move all descriptors before the four copies then the compiler fuses all TDM copies
o_proj went from 52.45 to 45.2 us in DSR1

[github-actions]

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[Copilot]

Copilot review overview

🟡 Changes recommended

The unrelated output-layout change should be separated, and the new comment contains a typo.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Revert unrelated output-store LDS layout change · New
• Fix typo: “Movbe” is misspelled · New

What changed in this PR

Updates the gfx1250 MXFP4 Gluon GEMM to enable fusion of staged TDM loads.

Changes:

• Groups descriptor updates before four asynchronous TDM loads.
• Adjusts wait counts for fused operations.
• Changes the output staging layout.

File	Description
aiter/​ops/​triton/​_gluon_kernels/​gfx1250/​gemm/​basic/​gemm_mxfp4.py	Refactors TDM staging and synchronization for load fusion.

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