[clang] [analyzer] Implemented the DanglingPtrDeref checker to detect use-after-scope lifetime errors (PR #209278)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat commented:

The code LGTM.

 I only blocked the automerge of the commit because I think it is important to remove the prefix `Report` from the name of the checker. Once that is fixed, feel free to merge this.

Also, don't forget to mention this commit in the release notes if it happens to be merged before the [branch cut](https://github.com/llvm/llvm-project/pull/207433#issuecomment-4959418957). (Although it is probably better to merge this _after_ the branch cut as I've seen that some improvements were postponed for follow-up commits.)

https://github.com/llvm/llvm-project/pull/209278