[llvm] [DebugInfo] Update DebugInfoFinder to take retainedNodes into account (PR #140285)

Fri May 16 10:37:16 PDT 2025

https://github.com/dzhidzhoev created https://github.com/llvm/llvm-project/pull/140285

Since https://reviews.llvm.org/D144004, DISubprogram's retainedNodes field is used to track DIImportedEntities, in addition to local variables and labels.

However, the corresponding update for DebugInfoFinder, to make it visit DISubprogram's retainedNodes, was missing.
This is the fix for it.

This change is separated from https://github.com/llvm/llvm-project/pull/119001 to simplify it.

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