viable/strict/1789514701: [Inductor] Eliminate no-op self slice_scatter after split (#195608)

发生了什么

Functionalization can emit split / getitem / slice_scatter chains that write an unchanged split view back to the same range of its original tensor. Recognize this exact no-op and return the base tensor. The rewrite fails closed for symbolic sizes, mismatched dimensions or ranges, non-unit steps, and non-split sources. Pull Request resolved: #195608 Approved by: https://github.com/eellison

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