[SOT] Skip restore same stack arg when partial fallback

[SigureMo]

PR Category

Execute Infrastructure

PR Types

Bug fixes

Description

问题出现在子图大小低于 MIN_GRAPH_SIZE 的 partial fallback 处理处

与 _build_compile_fn_with_name_store 不同，这里传入的 stack_vars 是可能有重复的，因此当同一个变量在前面迭代分配了名字后并存到 store_var_info 后，后面迭代的时候就走到了 else 分支，就会走 gen_store，但这明明是 ___graph_fn_saved_orig_ 生成的，就无法在原来函数名字里找到，会挂掉，进而导致整个函数 fallback

因此，存过了就直接 POP_TOP 就好了

_build_compile_fn_with_name_store 不需要处理，因为不会重复

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[Copilot]

Pull Request Overview

This PR addresses a bug in partial fallback handling when duplicate stack variables are encountered by skipping re-restoring variables that have already been processed. Key changes include:

• Adding new test cases in test/sot/test_min_graph_size.py to validate the fallback mechanism.
• Updating _restore_origin_opcode in function_graph.py to track and skip duplicate stack variable IDs using a set and calling gen_pop_top for duplicates.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/sot/test_min_graph_size.py	Added test functions to verify proper recovery of duplicate args during fallback.
python/paddle/jit/sot/opcode_translator/executor/function_graph.py	Introduced a check for duplicate stack variables to prevent fallback errors.

[codecov-commenter]

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Additional details and impacted files

@@ Coverage Diff @@ ## develop #72367 +/- ## ========================================== Coverage ? 91.42% ========================================== Files ? 1 Lines ? 455 Branches ? 0 ========================================== Hits ? 416 Misses ? 39 Partials ? 0 

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