llvm-project

4ec1fea9 - Reapply "[Clang] Mark this pointer in destructors dead_on_return (#166276)"

Reapply "[Clang] Mark this pointer in destructors dead_on_return (#166276)" This reverts commit 047db150c66e245e9df7db178b893ce6b29820f5. The original version of the commit caused assertion failures in DSE. Those were fixed in ec059d81aafedb253a02d6f490ad9b9747611038, so trying to reland this again.