[PATCH] D143984: [DebugMetadata] Simplify handling subprogram's retainedNodes field. NFCI (1/7)

[Kristina Bessonova via Phabricator via cfe-commits]

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RFC https://discourse.llvm.org/t/rfc-dwarfdebug-fix-and-improve-handling-imported-entities-types-and-static-local-in-subprogram-and-lexical-block-scopes/68544

Currently, `retainedNodes` tracks function-local variables and labels.
To support function-local import, types and static variables (which are globals
in LLVM IR), subsequent patches use the same field. So this patch makes
preliminary refactoring of the code tracking local entities to apply future
functional changes lucidly and cleanly.

No functional changes intended.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143984

Files:
  clang/test/CodeGen/attr-btf_tag-disubprogram-callsite.c
  clang/test/CodeGenCXX/aix-static-init-debug-info.cpp
  clang/test/CodeGenCXX/debug-info-cxx1y.cpp
  clang/test/CodeGenCXX/debug-info-template.cpp
  clang/test/CodeGenObjC/debug-info-category.m
  llvm/include/llvm/IR/DIBuilder.h
  llvm/include/llvm/IR/DebugInfoMetadata.h
  llvm/lib/IR/DIBuilder.cpp

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