Rebase to v0.5.15.post1 for internal testing

[akao-amd]

Motivation

Support internal testing of the next ROCm GA release.

Modifications

Previously amd_march has three commits on v0.5.13.post1, and now it has discarded the three commits and rebase on v0.5.15.post1.

This PR is to add the three commits back.

Accuracy Tests

N/A. This is a part of the ROCK CI effort. Downstream QA teams will be responsible for the tests.

Speed Tests and Profiling

N/A.

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.
• Follow the SGLang code style guidance.

Review and Merge Process

1. Ping Merge Oncalls to start the process. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments or contact authorized users to do so.
   • Common commands include /tag-and-rerun-ci, /tag-run-ci-label, /rerun-failed-ci
4. After green CI and required approvals, ask Merge Oncalls or people with Write permission to merge the PR.

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CI States

Latest PR Test (Base): ❌ Run #29996914085
Latest PR Test (Extra): ❌ Run #29996913634

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.