[clang] [clang][ExtractAPI] combine typedef records if the underlying type's name is underscored (PR #125964)

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dyung wrote:

> I don't see how that failure is related to my PR; my change was restricted to ExtractAPI, it shouldn't be affecting the driver invocations.

You can probably ignore it. I was about to take the machine offline to update it and might have interfered in the run somehow. The other builder did not show the failure when it built the next commit.

https://github.com/llvm/llvm-project/pull/125964