[CINN] Disable unused pool2d symbolic infer path

[ooooo-create]

PR Category

CINN

PR Types

Improvements

Description

该 PR 延续 #78417 的思路，继续收敛 cinn_op_infer_sym.cc 对 pooling 符号推导实现的源码级耦合。

本次排查后确认：
paddle/cinn/hlir/dialect/operator/transforms/pd_to_cinn_pass.cc 中虽然定义了 Pool2dOpPattern，但在 PdOpToCinnOpPass::InitializePatterns() 里并没有注册这个 pattern。也就是说，当前 pd_to_cinn_pass 并不会把 pd_op.pool2d 改写成 cinn_op.pool2d，因此 cinn::dialect::Pool2dOpInferSymbolicShape 这条路径当前并不在实际 pass 链路上。

基于这个现状，这个 PR 做了下面几件事：

• 在 paddle/fluid/pir/dialect/operator/interface/infer_symbolic_shape/cinn_op_infer_sym.cc 中注释掉 unary_infer_sym.cc 的 raw include。
• 在 paddle/fluid/pir/dialect/operator/interface/infer_symbolic_shape/cinn_op_infer_sym.h/.cc 中注释掉 Pool2dOpInferSymbolicShape 的声明和实现，避免保留一条当前不会被命中的 CINN pool2d symbolic infer 路径。
• 在 paddle/fluid/pir/dialect/operator/interface/infer_symbolic_shape/unary_infer_sym.cc 中顺手做了小范围清理：GetRealPadding 改为 const ref 传参，并把 UpdataPadding 更名为 UpdatePadding。

这次改动的目标不是修改 pool2d 的符号推导规则，而是把 cinn_op_infer_sym 的依赖关系和实际 pass 路径对齐，避免保留一条未注册 pass 的死路径。

是否引起精度变化

否

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[Copilot]

Pull request overview

This PR removes a raw .cc inclusion that was aggregating unary symbolic-shape inference into cinn_op_infer_sym.o, which could misattribute incremental coverage to the wrong object file.

Changes:

• Replace the source-level include of unary_infer_sym.cc with the proper header include unary_infer_sym.h.
• Make cinn::dialect::Pool2dOpInferSymbolicShape delegate directly to paddle::dialect::Pool2dOpInferSymbolicShape to avoid relying on internal helpers from the included .cc.
• Minor cleanup in GetRealPadding: fix lambda name typo and avoid unnecessary copies by using const& parameters.

Reviewed changes

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

File	Description
paddle/fluid/pir/dialect/operator/interface/infer_symbolic_shape/unary_infer_sym.cc	Minor parameter/lambda cleanup in pooling padding inference helpers.
paddle/fluid/pir/dialect/operator/interface/infer_symbolic_shape/cinn_op_infer_sym.cc	Remove raw .cc inclusion; reuse Paddle Pool2d symbolic-shape inference to decouple object files and coverage attribution.

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[ooooo-create]

目前经常需要开发者自己来证明这个文件的代码确实覆盖到了，例如： #78441 (comment)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@212a3f6). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...nterface/infer_symbolic_shape/cinn_op_infer_sym.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #78658   +/-   ##
==========================================
  Coverage           ?   66.66%           
==========================================
  Files              ?        2           
  Lines              ?        3           
  Branches           ?        0           
==========================================
  Hits               ?        2           
  Misses             ?        1           
  Partials           ?        0           

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[SigureMo]

merge 下 develop 吧，覆盖率不够是没单测吗？

[ooooo-create]

这个地方的逻辑本身就写的不对，所以直接注释了先

[ooooo-create]

merge 下 develop 吧，覆盖率不够是没单测吗？

pd_to_cinn_pass 里面没有注册这个转换，这个地方跑不到，原来的实现也不对😭