[clang] [analyzer] MallocChecker – Fix false positive leak for smart pointers in temporary objects (PR #152751)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat approved this pull request.

Thanks for all the updates!

I think the change is basically ready to merge, but I added two very minor suggestions in inline comments.

https://github.com/llvm/llvm-project/pull/152751