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

[Bojun Seo via llvm-commits]

Bojun-Seo wrote:

I'm still working on it, but this month’s AI tokens have all been used up. I’ll update the revision work at the beginning of next month.

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