[clang] [analyzer] Simplify SVal for simple NonLoc->Loc casts (PR #66463)

[Ding Fei via cfe-commits]

danix800 wrote:

`auto-merge` might be disabled probably. I can't find the button mentioned [here](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/automatically-merging-a-pull-request).

https://github.com/llvm/llvm-project/pull/66463