[Triton] Fix TritonLanguagePlaceholder missing tensor attribute

[wxsIcey]

Purpose

Fix TritonLanguagePlaceholder missing tensor attribute, this is because TritonLanguagePlaceholder does not have a tensor attribute, but compute_identity_kernel in fused_moe.py uses tl.tensor

Test Plan

existed CI passed

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• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
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[gemini-code-assist]

Code Review

This pull request correctly adds the missing tensor attribute to the TritonLanguagePlaceholder class. This is a necessary fix to prevent AttributeError when Triton is not installed. While the change is correct, I've added a comment regarding the corresponding unit tests, which should be updated to ensure this fix is verifiable and to prevent future regressions.

[wangxiyuan]

we hit this error in vllm-ascend. This PR can fix the problem.

[Yikun]

See vllm-ascend related issue: vllm-project/vllm-ascend#3175 , and introduced by 845adb3. It's same with 6617718, so LGTM

[DarkLight1337]

Thanks for fixing!

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @wxsIcey.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[DarkLight1337]

Oops, I forgot about #25649 which does the same thing. Closing this one