[AMD] Apply AITER_MXFP4_MOE_SF=1 only to gfx950 in aiter build

[hubertlu-tw]

Motivation

Apply AITER_MXFP4_MOE_SF=1 only to gfx950 in aiter build which resolves the current aiter build error on MI300X.
https://github.com/sgl-project/sglang/actions/runs/19269898923/job/55095147727#step:5:854

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.

CC: @sogalin

[gemini-code-assist]

Summary of Changes

Hello @hubertlu-tw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces targeted modifications to the Dockerfile responsible for building aiter on ROCm-enabled systems. The primary goal is to resolve a build error on MI300X GPUs by ensuring that the AITER_MXFP4_MOE_SF flag and corresponding environment variable are only activated when building for or running on the gfx950 architecture. This prevents unintended side effects on other GPU architectures while maintaining the intended performance optimizations for gfx950.

Highlights

• Conditional Build Flag Application: The AITER_MXFP4_MOE_SF=1 build flag for aiter is now applied conditionally, specifically targeting the gfx950 GPU architecture during the build process.
• Conditional Environment Variable Setting: The AITER_MXFP4_MOE_SF environment variable is now set to 1 at runtime only for gfx950 architectures, preventing its application to other GPU types.
• MI300X Build Error Resolution: These changes are implemented to resolve a reported build error that occurred on MI300X systems, which was caused by the unconditional application of the AITER_MXFP4_MOE_SF flag.

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[gemini-code-assist]

Code Review

This pull request conditionally applies the AITER_MXFP4_MOE_SF=1 flag only for the gfx950 architecture during the aiter build in the ROCm Dockerfile. This is intended to fix a build error on MI300X. The changes correctly implement the conditional logic. My review includes suggestions to remove some dead code and to refactor the shell commands for better readability and maintainability.