fix: Cold self-review found the libinfo.py fix duplicated an existing

[singlaamitesh]

Fixes #20031

Summary

Cold self-review found the libinfo.py fix duplicated an existing mechanism (tvm.contrib.cutlass.has_cutlass(), which already probes the 'relax.ext.cutlass' global function registered only under USE_CUTLASS=ON) using a different, less-canonical symbol, and was missing the codebase's standard import-outside-toplevel pylint-disable on a local import. Aligned libinfo() to check the same 'relax.ext.cutlass' symbol as has_cutlass(), and updated both regression tests to call has_cutlass() directly instead of re-deriving the check. The GEMM ${A_arg}->${lhs_arg} template fix and the missing tvm/ffi/container/tensor.h header fix were re-verified unchanged and correct.

Changes

• python/tvm/support/libinfo.py
• python/tvm/contrib/cutlass/gemm_operation.py
• python/tvm/contrib/cutlass/gen_tensor_op.py
• tests/python/support/test_libinfo.py
• tests/python/testing/test_env.py
• tests/python/contrib/test_cutlass_gemm.py

How this was tested

Ran tests/ locally.

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[gemini-code-assist]

Code Review

This pull request fixes issues with CUTLASS template instantiation and build flag detection. Specifically, it corrects an undefined template variable (${A_arg} to ${lhs_arg}) in gemm_operation.py, adds the missing tvm/ffi/container/tensor.h header in gen_tensor_op.py, and dynamically detects whether USE_CUTLASS is enabled by probing for the registered native global function instead of hardcoding it to OFF. Unit tests have been added to verify these fixes. There are no review comments, so I have no feedback to provide.

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