[clang-tools-extra] [clang-doc] Improve performance by adding a short circuit (PR #96809)

[Paul Kirth via cfe-commits]

ilovepi wrote:


> When sorted by USR, there are no differences between the index between this patch and what's on main,

I'm not sure I completely follow. are you saying that when you sort the contents of all the files you no longer have any differences? So you're sure the only differences in output are due to ordering? I'd suppose that is rather expected from a racy framework, like clang-doc. 

Once the tests PRs are landed, can you rebase this patch, so we can see the affects on the larger tests?

https://github.com/llvm/llvm-project/pull/96809