[clang] Reduce memory usage in AST parent map generation by lazily checking if nodes have been seen (PR #129934)

[via cfe-commits]

llvmbot wrote:

<!--IGNORE-->
>/cherry-pick 8c7f0eaa6ee3f84e3d8260535cced234bed4fa28

Error: Command failed due to missing milestone.

https://github.com/llvm/llvm-project/pull/129934
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