[llvm] [llvm-debuginfo-analyzer] Remove `LVScope::Children` container (PR #144750)

[Carlos Alberto Enciso via llvm-commits]

https://github.com/CarlosAlbertoEnciso commented:

As the removal of the `Children` in somehow depends on the new `sort` options, the general documentation should include a short explanation about the `getChildren' and `getSortedChildren` to describe the concatenation order and their interaction with `sort`.

https://github.com/llvm/llvm-project/pull/144750