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

[Corentin Jabot via llvm-commits]

cor3ntin wrote:

Note that the RFC has not yet been approved by the LLVM area team. In the meantime it would be better to try to have discussions on discourse as to not have discussions in multiple places.

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