[clang] [compiler-rt] [sanitizer] Add DoubleFreeSanitizer (DSan) (PR #213846)

[Bojun Seo via cfe-commits]

Bojun-Seo wrote:

> The AI disclosure should be added to the pull request description at the top of this page. When the pull request is merged, the commits are squashed, and it is the pull request description (unless manually edited) that lands as the upstream commit.

Thanks, I wasn't aware of that rule. I will make sure to add the AI disclosure to the PR description when I update the patches.
 
> Unrelated, but on the topic of logistical nits: "In general, you should avoid rebasing a Pull Request and force pushing to the branch that’s the root of the Pull Request during the review. This action will make the context of the old changes and comments harder to find and read." (https://llvm.org/docs/GitHub.html#rebasing-pull-requests-and-force-pushes)

Thanks for the heads-up. I've already rebased it once, but I can restore the previous state. I will avoid force-pushing and just append commits.

https://github.com/llvm/llvm-project/pull/213846